Tag: raster function

Fantasy Maps Pt 1 | Mountainification


This is part one of a three-part blog extravaganza where I lay out how you might whip up a fantasy-style book-ish illustration-y map insert, in ArcGIS Pro. This technique, which is a total hack (but what isn’t, ultimately), can get … Continue reading

Posted in Analysis & Geoprocessing, ArcGIS Online, ArcGIS Pro, Cartographic Design, Geodata, Imagery, Mapping, Open Data, Uncategorized | Tagged , , , , | 7 Comments

New Aspect-Slope Raster Function Now Available

Aspect-slope map thumbnail

Use a newly available Aspect-Slope Raster Function that can be downloaded from Esri’s GitHub repository for raster functions to quickly and easily create an aspect-slope map from raster elevation data. Continue reading

Posted in ArcGIS Pro, ArcMap, Cartographic Design, Imagery, Mapping, Python | Tagged , , , , , , , | 11 Comments

Why are some processes grayed out in the Image Analysis window?


The Processing pane on the Image Analysis window contains various tools that can instantaneously process your data on-the-fly.  However not all of the button are active all of the time.  This is because each tool is dependent on the layers … Continue reading

Posted in Imagery | Tagged , , , | 4 Comments

Super-Fast, Server-Side Raster Analysis on the Web (APL re-post)


Here is a link to an Applications Prototype Lab (APL) blog post in case you missed it.  This blog shows you chained raster functions doing server-side analysis in a web application.

Posted in Imagery | Tagged , , | 2 Comments

How do I persist the processing outputs that were created using the Image Analysis window?


There are several ways to persist your Image Analysis results.

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Apparent Reflectance Raster Function

apparent reflectanceThe Apparent Reflectance raster function calibrates image brightness values (DN) for some satellite sensors. The main advantage of apparent reflectance function is to adjust the images to a theoretically common illumination condition, so there should be less variation between scenes from different dates and from different sensors. This can be useful for image classification, color balancing, and mosaicking.

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Posted in Imagery | Tagged , , | 28 Comments

Video: Raster Products

Sumbitted by: Melanie Harlow, Esri

Last week’s Imagery Blog  discussed what a raster product was and why they are useful.

If you would like to see a video about raster products, there is one available on the ArcGIS Resource Center.


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Raster Products in ArcGIS 10.1

Raster ProductBy: Simon Woo, Product Engineer, Esri

At ArcGIS 10.1, we introduce a new concept called a raster product. A raster product is a new and easier way to handle specific vendor data. Most vendor products are distributed with each band as its own file. This meant that you had to process the data before you could use it as one raster dataset.

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Do I need to calculate statistics on a mosaic dataset after a raster function is applied?

Calculating statistics are not always required after you apply a function.  However, there are times when it may be helpful or even required.

When are statistics required?
Color correction requires up-to-date statistics.  Therefore if any functions have been applied to your mosaic dataset, since statistics were last calculated, you will need to calculate them again.

When are statistics a good idea?
Often times when you apply a function, it can change the (virtual) pixel values. If you want to keep your mosaic dataset using the most accurate statistics and rendering, then you will need to calculate statistics again.

For instance, when you use the Stretch function to map your 8-bit data to a 16-bit pixel depth, your images will probably show up black, unless you calculate statistics.

Written by: Simon Woo and Jie Zhang

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Mosaicking rasters using the Image Analysis window

Is your mosaic being mosaicked in the proper order when you are using the Image Analysis window?

The Image Analysis mosaicking order is determined by the mosaic operator that you choose, and the order of the rasters in your Table of Contents. The order that you selecthighlight the rasters in the Layer List is not taken into consideration.

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