1 / 11

Managing Large Image Collections - ESRI Image Catalogs Overview

Learn how to efficiently handle large image collections exceeding 2GB using ESRI's Image Catalogs. This workshop covers creating, managing, and manipulating raster catalog data for spatial analysis. Streamline your workflow and optimize image storage.

natala
Download Presentation

Managing Large Image Collections - ESRI Image Catalogs Overview

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Building Base Maps

  2. Managing large image collections • Large images can easily exceed the 2-GB limit on file size • ESRI offers two major ways to manage spatially tiled images • Image Catalogs • ArcSDE Rasters (has 5 ways to handle, but beyond scope of this class) StreamStats Data Prep Workshop Oct 21-22, 2003

  3. Raster (a.k.a Image) Catalogs • Group of raster files covering a similar theme and sharing coordinate system • Often same format and symbology • Examples: • Map series (DRGs) • Orthophotos (DOQs) StreamStats Data Prep Workshop Oct 21-22, 2003

  4. Raster Catalogs • Display multiple rasters without having to merge them into larger rasters • Supported very well in ArcView 3 • Supported in ArcPlot, but can’t do a transparent NODATA • Also supported in ArcMap, but you need a script to do transparent NODATA StreamStats Data Prep Workshop Oct 21-22, 2003

  5. Raster Catalogs • Format: any table with columns:IMAGE, XMIN, YMIN, XMAX, YMAX • IMAGE is a pathname to the raster • Symbology from first raster in catalog • ArcObjects Online sample code exists to help in symbolizing catalogs StreamStats Data Prep Workshop Oct 21-22, 2003

  6. Working with Image Catalogs • Prerequisites: • Images in supported formats • Georeferenced, spatial reference specified in ArcCatalog • All images must use the same colormap • If overlapping, need a special value for overlaps or NODATA areas StreamStats Data Prep Workshop Oct 21-22, 2003

  7. Image Catalog Procedures:DRG Example • Get DRGs. Best source: NRCS state offices on CD • Decide on projection, datum • Clip_project_DRG.aml • Project if necessary • Trim collars • Assign spatial reference: BatchRasterSpatialRef.bas • Use a system variable for base of paths in image catalog for portablility

  8. Create Image Catalogs • Arc CREATECATALOG command • Arc ADDIMAGE command • Drgcatalog.aml does both, adds all images in a folder to the catalog • Folder2ImageCatalog.bas works in ArcCatalog, can do .SID files • Other AMLs: • copyimagecat.aml (copies images) • trimimagecat.aml (deletes images from disk) StreamStats Data Prep Workshop Oct 21-22, 2003

  9. Raster Catalog Pitfalls • Make sure all files and folders are NOT read-only • Do NOT load into ArcMap until you are sure all paths are correct and all images have spatial references • If you load it with a bad spatial reference you will never be able to load it correctly StreamStats Data Prep Workshop Oct 21-22, 2003

  10. Changing Symbology for an Raster Catalog • No Symbology tab • There’s no way to store a transparent color in a TIFF colormap • Must use a script to get a ‘renderer’ from one image, apply it to all • ChangeCatalogSymbology.bas StreamStats Data Prep Workshop Oct 21-22, 2003

  11. Other base maps • NLCD • Shaded relief at both 90- and 30-meter resolutions • Precip, other layers used • Make these TIFFs, they work better in ArcIMS StreamStats Data Prep Workshop Oct 21-22, 2003

More Related