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Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Asep Saepuloh, Dr. Eng.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
What is a Digital Elevation Model (DEM)?
Digital representation of topography model based on scale of original data
Commonly a cell based data where a cell has a single elevation which represents the entire area covered by the cell
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Why use elevation data?
Importance of terrain in hydrology and environmental modeling
Visualization of landscapes
Geomorphologic
Surface Geology
Structures Geology
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Creation of DEMs
Conversion of paper maps Scanned, digitized contour lines
USGS produces 10 and 30 meter DEMs
From original photogrammetry (Lidar)
From Space Shuttle topography mission 30 - 90 meter DEM data.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Santa Barbara, California
http://srtm.usgs.gov/srtmimagegallery/index.html
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
http://srtm.usgs.gov/srtmimagegallery/index.html
San Andreas Fault, California
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
http://srtm.usgs.gov/srtmimagegallery/index.html
Salt Lake City, Utah
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
http://srtm.usgs.gov/srtmimagegallery/index.html
Mt Kilimanjaro, Tanzania
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Shuttle Radar Topography Mission (SRTM)
1 arc-second elevation data for the United States, 3 arc-second data for the globe
Produced by radar measurements from a Shuttle mission, Feb 11-22, 2000
http://srtm.usgs.gov/data/obtainingdata.html
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Interferometry used by SRTM In interferometry, two
images are taken from
different vantage
points of the same
area.
The slight difference in
the two images allows
scientists to determine
the height of the
surface.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
SRTM Coverage 56°S to 60°N
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Cell Size 30m 100m
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Basic storage of data
340 335 330 340 345
337 332 330 335 340
330 328 320 330 335
328 326 310 320 328
320 318 305 312 315
DEM as matrix of elevations with a uniform cell size
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Adding geography to data
340 335 330 340 345
337 332 330 335 340
330 328 320 330 335
328 326 310 320 328
320 318 305 312 315
Xmin, Ymin – XY are in projected units
Xmax, Ymax
Cell index number x cell size defines position relative to Xmin, Ymin and Xmax, Ymax and infers an exact location
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Scale in DEMs
Scale determines resolution (cell size)
Depends on source data
Resolution determines use of DEM
what spatial features are visible
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Errors in DEMs
Typos occur frequently in DEMs
Most common variety are “sinks” and “spires”.
Sinks occur when a very low elevation, relative to surrounding cells, is entered.
Spires occur when a very high elevation, relative to surrounding cells, is entered
Both appear as tightly packed contours
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
A natural sink?
340 335 330 340 345
337 332 330 335 340
330 228 320 330 335
328 326 310 320 328
320 318 305 312 315
By default, this “sink” is removed, whether or not it is real.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Correcting sinks and spires
Most GIS have a “Fill” function
which looks for sinks and fills
them or looks for spires and
removes them
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Estimating slopes in a DEM Slopes are calculated locally using a
neighborhood function, based on a moving 3×3 window
Distances are different in horizontal and vertical directions vs diagonal
Only steepest slopes are used
1.41… 1.00 1.41…
1.00 0.00 1.00
1.41… 1.00 1.41…
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Slopes
340 335 330
337 332 330
330 328 320
(elevations)
8/42.47 3/30 2/42.47
5/30 0 -2/30
-2/42.47 -2/30 -12/42.47
(difference/distance)
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Flow direction in a DEM
340 335 330 340 345
337 332 325 335 340
330 328 320 330 335
328 326 310 320 328
320 318 305 312 315
Flow directions for individual cells
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
32 64 128
16 Source
Cell 1
8 4 2
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Finding watersheds …
Begin at a source cell of a flow direction database, derived from a DEM (not from the DEM itself
1. Find all cells that flow into the source cell
2. Find all cells that flow into those cells.
3. Repeat …
All of these cells comprises the watershed
The watershed is generalized based on the cell size of the DEM
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Watersheds …
Contour lines (brown) Drainage (blue) Watershed boundary (red)
Once done manually …
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Flow accumulation
1. The number of cells, or area, which
contribute to runoff of a given cell
2. Accumulation, once it reaches a
threshold appropriate to an region,
forms a drainage channel
3. Accumulation is the area of a
watershed that contributes runoff to a
given cell.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Flow accumulation in a DEM
0 0 0 0 0
0 1 3 1 0
0 1 8 1 0
0 1 13 1 0
0 2 24 2 0
Flow accumulation for individual cells Errors may occur at the edges of DEMs.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Flow accumulation as drainage network
Drainage network as defined by cells above threshold value for region.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Tugas
Menghitung gradien slop dengan data
DEM (spreed-sheet)
Tentukan/Delineasi daerah akumulasi air
(lembahan)
Tentukan/Delineasi daerah tangkapan
air (punggungan)
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
SHADED RELIEF MAP
Applicability for:
1. Geological structure identification
2. Geological hazard assessment
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
30 km
1. Shaded relief map for active faults identification
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
10-m
ete
r DE
M fro
m c
on
tou
rs
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
12-ft D
EM
from
LID
AR
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
From the Newport and
Withamsville quadrangle
by Gibbons (1973):
Landslide types and geology
2. Shaded relief map for land
slides identification
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Kenton and Campbell Co.
landslides
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Example: LiDAR derived
hillshade DEM with contours
Mapped landslide
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Example: LiDAR derived
hillshade DEM without contours
Mapped landslide
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Example: LiDAR derived
hillshade DEM with contours
Mapped landslide
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Another example of subsequent failure
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Another example of subsequent failure
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Shaded Relief Creation Cos (incidence angle) =
[Sin(elevation)*Cos(slope)]+
[Cos(elevation)*Sin(slope)*Cos(azimuth - aspect)]
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
Center for Remote Sensing (CRS) Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Gdg. Labtex IX-C, Lt. 3 Jln. Ganesha, No. 10, Bandung, Indonesia
PT. KARVAK NUSA GEOMATIKA Ruko Jambore Park, Jl. Jambore Raya No. 89A, Cibubur - Jakarta Timur. Indonesia. 13720.
TUGAS 1. Gunakan ReliefShader untuk
membuat peta shaded Lidar dengan
arah penyinaran azimuth/altitude sbb:
0/50
90/50
180/50
270/50
2. Identifikasi struktur untuk setiap peta
shading di atas:
Linear (faults/fractures)
Circular (crater/land sliding)