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Building Base Maps

Building Base Maps. 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). Raster (a.k.a Image) Catalogs.

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Building Base Maps

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  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

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