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.
Data Sources
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.
10 Free GIS Data Sources: Best Global Raster and Vector Datasets
Turbo-charge your search for free GIS data with this list of 10 free, downloadable global GIS datasets from highly reputable sources – vector and raster.
Natural Earth Data – Free GIS Public Domain Data
Natural Earth data is a free raster and vector (cultural and physical) data package containing the most common elements that you need to create a map.
ArcGIS Shapefile Files Types & Extensions
ArcGIS shapefile files are composed of mandatory files (SHP, SHX and DBF) and optional files (PRJ, XML, SBN and SBX). This article lists their functions.