15 Free Satellite Imagery Data Sources
If you’re searching for free satellite imagery, we rank the best sources of free satellite data from authoritative sources like NASA, USGS and DigitalGlobe.
Data Sources
How to Download Free Sentinel Satellite Data
If you want to download Sentinel satellite data, then you’ve come to the right place. We show you step-by-step how to obtain free Sentinel satellite data.
Spatial Databases – Build Your Spatial Data Empire
From geodatabases to PostGIS, spatial databases have quickly become the primary method of managing spatial data effectively in a GIS.
USGS Formats DLG, DRG and DOQ – Vector and Raster Formats
Over the years, the USGS has been a driving force in the production of GIS data. The USGS formats we explore are DLG, DRG and DOQ.
What is Bit Depth for Satellite Data (and Images)
Bit depth is the amount of detail in each pixel expressed in units of bits. 1-bit rasters contain 2 values while 8-bit rasters range from 0-255
Image Compression and Encoding for Raster Data
Deploying efficient raster GIS compression techniques means reducing storage space. It can save money, time and also help network performance.
Vector vs Raster: What’s the Difference Between GIS Spatial Data Types?
The main spatial data types are vectors and rasters. Rasters have grid cells while vectors are points , lines and polygons consisting of vertices & paths.
TIGER GIS Data (Topologically Integrated Geographic Encoding & Referencing)
TIGER GIS data has transformed the GIS environment because it was the first nationwide digital map. It stimulated projects like MapQuest, Yahoo & Google.
Unsigned Integer vs Signed Integer for Raster Data
Unsigned integer rasters are non-negative numbers. Signed integers can store negative values. IMG, TIFF & GRID formats are acceptable for signed integer
Top 6 Free LiDAR Data Sources
Does it feel like a big challenge to find LiDAR data sources? Master the art of attaining LiDAR at no cost with this list of 6 free LiDAR data sources.