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# GIS Analysis

## What is Tobler’s First Law of Geography?

Tobler’s First Law of Geography states that everything is related to everything else, but near things are more related than distant things.

## What is Conflation, Edge Matching and Rubbersheeting?

When you have two conflicting data sets, conflation resolves conflicts by preserving the most accurate one. Edgematching and rubbersheeting helps fix errors

## Kriging Interpolation – The Prediction Is Strong in this One

The prediction is strong in kriging. In this guide to geostatistics we embark on a journey to sculpt a legendary prediction model with kriging interpolation

## What Are Contour Lines on Topographic Maps?

Contour lines have constant values on them such as elevation. But it’s also used in meteorology (isopleth), magnetism (isogon) & even drive-time (isochrones)

## Death, Taxes and the Esri ArcGIS 999999 Error: How to Fix It

Some things in life are certain. In ArcGIS, it’s the Esri 999999 error. Here are some techniques to troubleshoot this ArcMap error and put it to rest.

## Semi-Variogram: Nugget, Range and Sill

In the case of a semi-variogram, closer things have less variability and are similar. While things farther away are less predictable and are less related.

## Rasterization and Vectorization: How to Convert Data Formats

Rasterization converts vectors into rasters. While vectorization transforms rasters in vectors. We explain how to go from one data model to the other.

## Huff Gravity Model: How Many Customers Will Visit Your Store?

Huff Gravity Model uses store size and distance along with census tract population to understand the probability that consumers will patron retail stores.

## A Topographic Profile of Arizona’s Massive Meteor Crater

Topographic profiles are cross-sectional views showing elevation along a line with applications in engineering, hydrology, land use planning and more.

## 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.