A Python Tool to Process Landsat Images

William J. Kramber Idaho Department of Water Resources

Esri International Users Conference, San Diego, CA July 22, 2015

Landsat 8 NASA/USGS

Landsat USGS/NASA mission L1 launched 1972

Current satellites

L7 launched 1999 L8 launched 2013

15/30/100-120 meter (Pan/Multispectral/Thermal)

16 day cycle 106 by 115 miles Landsat 9 launch 2023

NASA

NASA

Landsat 7

Landsat at IDWR Since 1975

Land use and land cover mapping Water rights evaluation Conservation Reserve Enhancement Program Mapping Evapotranspiration (ET)

Hydrologic modeling Endangered Species Planning Water Delivery Call Curtailment Order

CREP

2006 Evapotranspiration

Eastern Snake Plain Aquifer Model

2010 Irrigated Land Use

Landsat Archive

USGS EROS Center, Sioux Falls, SD Over 4 million scenes July 1972 to present (thermal since 1984) Free Search and download sites:

Earth Explorer (earthexplorer.usgs.gov) GloVis (glovis.usgs.gov)

Download Landsat data (path 40 rows 30 and 31, 2014)

Process Landsat 8 Tool

Starting 1 of 26

Finished 26 of 26 (11.5 hours)

Dell OptiPlex 790 3.4 GHz Core i7 processor 16 GB memory Two 1 TB hard drives AMD 1GB Radeon 6450 dual video card

Output Folders

p40r30_l8_20140610

p40r30_l8_20140610

Tool Summary Create list of gz files for gz in gzList: Check Directory and create Subdirectory Copy gz to Subdirectory Uncompress gz and tar files Project band 8 and BQA to IDTM83 Project other bands to IDTM83 Trim bands to 0 where any of the bands has 0 Create mask of 0 and 1 Create 10-band composite Create 3-band (564 and 543) composites Apply 2.2 SD Contrast Stretch to 3-band composites Compute TOA Reflectance Compute NDVI End of Tool ArcGIS Tools used

ProjectRaster CellStatistics Con SetNull CompositeBands ExtractByMask CalculateStatistics CopyRaster

Set Null: change gaps to nodata Zonal Statistics: compute mean of polygons Is Null & Con: replace gaps with mean value

L7 gaps filled using ArcGIS Tools

Gaps in Landsat 7 Gaps filled

For more information Earth Explorer earthexplorer.usgs.gov IDWR idwr.idaho.gov Mapping Evapotranspiration idwr.idaho.gov/GeographicInfo/METRIC/et.htm

Seasonal Evapotranspiration for Cropland in 2000

Landsat 9

2023 or better yet 2021

Future work

ProcessLandsat8 Tool Pan-sharpen 3-band composites

Smart Eliminate Tool for ArcGIS

MRLC NLCD Mapping Tool www.mrlc.gov/resources.php

bill.kramber@idwr.idaho.gov