What is a Horizontal Datum Reference Frame?
A horizontal datum provides a reference frame for latitude and longitude coordinates on the Earth. A datum is constructed through surveys and triangulation.
Articles
4 Weather Data Sources for GIS
Some of the best GIS weather data available can be found at NWS, PRISM, MADIS and Weather Source. This GIS weather data dates back from past to present.
1000 GIS Applications & Uses – How GIS Is Changing the World
From over 50 industries, here are 1000 GIS applications to open your mind of our amazing planet, its interconnectivity with location intelligence in mind.
Python Minimum or Maximum Values in ArcGIS
Python minimum and maximum values in ArcGIS can be obtained from multiple fields. This is done with min and max commands using Python and Field Calculator.
How to Convert NoData to Zero for Rasters in ArcGIS
Changing NoData values to zero in arcGIS can be accomplished by using the “Con Tool”
Image Classification Techniques in Remote Sensing [Infographic]
We look at the image classification techniques in remote sensing (supervised, unsupervised & object-based) to extract features of interest.
Equal Interval Classification in GIS
The equal interval classification method divides attribute values into equal size range taking the data’s minimum and maximum values.
Spectral Signature Cheatsheet in Remote Sensing
Every object has its own unique composition. This is equivalent to it having its own spectral signature. Choose the spectral bands for ideal classification
NAD27 – Meade’s Ranch at the Center of It All
Meade’s Ranch was the focal point of the NAD27 with all positions relative to it. First-order triangulation was used with approximately 26,000 survey points
Datum Transformations – Converting Coordinates from NAD27 to NAD83
NAD27 and NAD83 may differ in tens of meters for horizontal accuracy on location. Datum transformations correct your data from one datum to another.