Melanie Harlow

Melanie Harlow
I've been with Esri for over 10 years. The first 10 were in Development and now I'm in Tech Marketing. My main focus at Esri is with with raster and image data.

Recent Posts

How to create a hosted feature service

Createing a Service

Did you know you can create a new feature service in ArcGIS Online, without needing to create it in ArcGIS for Desktop first? This blog lists the main ways to create a new feature service that is hosted in your … Continue reading

Posted in ArcGIS Online, Developer | Tagged , | 3 Comments

How we created the CityEngine Web Scene for the March 2014 Oso Landslide

Oso Landslide Web Scene: Before and After

On the morning of Saturday, March 22, 2014, a major landslide occurred near the city of Oso, Washington, instantly devastating the Steelhead community in its path and drastically altering the landscape. Esri’s Disaster Response Team quickly published a set of … Continue reading

Posted in 3D GIS, ArcGIS Online, Imagery, Mapping, Public Safety, Story Maps, Web | Tagged , , , , , , , | Leave a comment

Map extents in ArcGIS Online

Set Extent dialog box

Have you ever tried to create two maps with the same extent? You line everything up on your monitor in the same place, use the same scale, and click Save. But when you open the two maps in another computer … Continue reading

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How we made the Rim Fire Critical Points of Interest Map

Rim Fire Critical Points of Interest Map

Creating a map showing a fire perimeter with ArcGIS Online is more straightforward than you might think. The most important layer—the fire location and perimeter—is a publicly shared layer in ArcGIS Online that is generated from a data feed provided … Continue reading

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Using tiled images with coordinates stored in a table

There’s a lot of tiled imagery out there that gets delivered to people without any coordinates stored with the files. Often the coordinate information exists but it’s stored in a table. So how do you view it in ArcGIS. Continue reading

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Color balancing GeoEye imagery

color balanced

Recently, I acquired two scenes of GeoEye imagery. They were provided as 7 different images. I opened the properties for each image, by clicking the raster product icon in the Catalog window and looked at the Key Metadata tab to … Continue reading

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How to view tiled images from GeoEye as one image

4 tiles

Recently, I needed to order some imagery over an area in Bolivia. I searched a few provider databases and discovered that GeoEye had the best coverage in my area. Below, my area of interest is shown by the red square. … Continue reading

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Displaying imagery with appropriate band name labels

Custom Product Definition

At 10.1, ArcGIS is more knowledgeable about the names of bands in the supported satellite imagery. You may have noticed this if you’ve added such an image to your map document by selecting the raster product in the Catalog window and dragging … Continue reading

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Come meet the Raster team at the 2012 Esri Developer Summit

Come meet the Raster team at the 2012 Esri Developer Summit

This year’s Esri Developer Summit will take place from March 26th to March 29th at the Palm Springs Convention Center.
        More information about the 2011 Developer Summitt
        View the Agenda

Come by and meet the members of the Raster Team, whether you have a question, or just want to meet some of the team. There are several way to meet us: you can come by the Showcase Area, you can attend our Technical Workshops or Demo Theaters, or you can join us at the Meet the Team event.  Continue reading

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For those using Esri Grid

The Esri Grid format for storing raster data has been around for…well, longer than this writer has been doing GIS. But we keep learning about things that need to be added to the documentation.  I’m sure those original Grid users could probably tell me more than I ever wanted to know about the format, but here’s a limitation that was news to me.

The name of a Grid has certain limitations, but did you also know that there’s a limit to the number of Grids that can be stored in a workspace? The following lists the theoretical maximum number of Grid datasets that can be stored in a single workspace directory:

  • less than 5000 floating point Grids, or
  • less than 3333 integer Grids, with VATs (less than 5000 if no VATs), or
  • less than 10000 Grid stacks

The preceding numbers are the theoretical maximums. If you have a process that will create interim Grids (and therefore files in the INFO directory) these numbers will be less. Additionally, if you are storing a mix of files, such as Grids and coverages, you will store fewer.

These numbers relate to the number of files in the Grid folder that store information in the INFO directory. The limit is 10,000 (well, 9,999), but it’s not the total number of files in an INFO directory, it’s the number of files pointing to the files in the INFO directory. For each Grid, there are two files in the Grid’s folder pointing to files in the INFO folder: the BND (boundary) files, and STA table (statistics) files (9999/2?5000). When a Grid has a VAT, this also points to files in the INFO directory, so the number that can be stored is reduced again (9999/3?3333). A Grid stack only has a single file which points to the INFO directory (9999/1?9999).

You can get a count of the number of files in an INFO directory using Windows Explorer.

  1. Navigate to the INFO directory.
  2. Select all the *.dat files (each Grid file points to a .nit and a .dat file).
  3. Right-click and select Properties.

This will give you the count of files. Regardless of the data is in the directory (Grids, stacks, coverages, etc.), when that number gets to 9999, the INFO directory is full and you’ll get an error message to the effect of: “Fatal Error: (INFDEF) directory full”. If you happen to come across this limit, you can either create a new workspace to work in, or remove any data that is no longer needed.

Melanie Harlow

Posted in Imagery, Migrate | Tagged , | Leave a comment