BioBase Data Use in QGIS 3.X

Tutorial: Converting BioBase grids to raster

© Navico, Inc. 2019

Export Depth, Vegetation, or Bottom Hardness (Composition) Grid Data from your BioBase account.

Data are exported as comma delimited point features in the universal WGS84 global coordinate system (right-click data in browser save as .csv)

Add X,Y Data and specify the WGS84 coordinate system

The view of unprojected ciBioBase grid data

Project the data into a meter projection (UTM is pretty standard) in the Data Frame Properties. Make sure you use the correct local datum (e.g.,

NAD83 Zone 15N for Minnesota USA)

http://www.ems-i.com/

If using UTMs NAD83 Datum, consult this chart to determine your zone (US Only). Datum vary widely across the globe; use one that is in accordance with

your local standard

Change the Display to Meters

Project the Data Frame into the appropriate local projection and datum

Right click and export to .shp. Save the data in the projection of the projected Data Frame

measure grid cell size using the measure line tool;

Rasterize Tool;

Actual individual cell sizes in BioBase vary. Overestimating actual grid cell sizes will result in blurry and inaccurate output. Underestimating will result in

empty space in between cells

The conversion to raster is complete! Now a range of spatial data analyses can be conducted. To create

publication quality imagery see the “Creating Publishable Quality Imagery” tutorial