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How To Use Zonal Statistics

How To Use Zonal Statistics

Zonal Statistics uses groupings to calculate statistics (sum, mean, maximum, etc) for specified zones like countries, watersheds or parcels.

How To Mosaic Raster Datasets

How To Mosaic Raster Datasets

A mosaic combines multiple raster images to obtain a seamless raster. We show you how to mosaic raster datasets in ArcGIS and QGIS.

Least Cost Path Analysis in GIS

Least Cost Path Analysis in GIS

The least cost path finds the most cost-effective path, from a start point to a destination, making it a useful tool for linear routing.

What Is Flow Direction in GIS?

What Is Flow Direction in GIS?

Flow direction calculates the direction water will flow in its eight adjacent cells using slope from neighboring cells (in a raster grid cell)

How to Fill NoData for Raster Data

How to Fill NoData for Raster Data

SAGA GIS has a quick and dirty tool to fill NoData holes with raster data. We show you how to close gaps in DEMs or any raster data with holes in it.

What is Map Algebra? [Raster Math]

What is Map Algebra? [Raster Math]

Map algebra is a cell-by-cell combination of stacked raster grids. It uses math-like functions with arithmetic, statistics and trigonometry operators.