### How to Calculate Mean Absolute Error (MAE) in Excel

This guide shows how Mean Absolute Error in GIS is used. We give a step-by-step instructions how to calculate MAE in Excel and a quick formula to use.

### Time Series Animation in ArcGIS

Configure your time series animation in ArcGIS with this quick tutorial. Visualize geographic events (snow melt, forest fire, disease) as a function of time

### Use Principal Component Analysis to Eliminate Redundant Data

Principal component analysis PCA identifies duplicate data over several datasets & aggregates essential information into groups called principal components.

### How to Calculate Root Mean Square Error (RMSE) in Excel

Root Mean Square Error (RMSE) in GIS can be used to calculate how much error there is between predicted and observed values. (ex. error in a DEM)

### Adding Excel Lat Long Coordinates into ArcGIS

Follow these quick 5 steps and turn Excel lat long coordinates into spatial data in ArcMap. Set to WGS 1984. Add table. Display XY Data. Export shapefile.

### 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.

### Spatial Autocorrelation and Moran’s I in GIS

Spatial Autocorrelation helps us understand the degree to which one object is similar to other nearby objects. Moran’s I is used to measure autocorrelation.

### ArcGIS Projections: Define Projection and Project

For ArcGIS projections, define projection changes the metadata describing the current projection. The project tool changes the projected coordinate system.

### ArcMap Tips and Tricks: The 7 Golden Rules

This list is a collaborative effort of the most valuable Esri ArcMap tips and tricks. Follow these golden rules and you will save time and improve workflow.

### 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.