Scripts By Jack™

How to Handle Imagery and GIS Data

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• Requires knowing the imager source.
• Fixes imagery that uses "0" for both brightness and fill pixels
• Output is another set of image data (BL, GL, ... MC).

• Related: FAQs by Jack B and FAQs by Jack A (pdf)
• Calibrate Satellite Images to Surface Reflectance
• Processes source imagery data to produce SRFI rasters and pair of PVI and PBI rasters (plus SRFI.txt, a processing report).
• Requires knowing the imager source, the collection date, the processing date, and solar elevation angle.  Defaults may be otherwise taken.  But recommend HEP=20 for QB, and HEP=500 for Landsat 7 -- not much effect on results.
• Input may be output rasters from REPAIR_IMAGE.sml

• Related: FAQs by Jack C (pdf)
• Mapping Dense Vegetation and Bare Soils
• Requires that a matching Mask Raster (MK) exist (to define area of interest that contains bare soil and dense vegetation).
• Takes SRFI rasters and PVI & PVI and produces a set of Diagnostic Rasters (DBL, DGL, ...).
• Input may have been produced by SRFI.sml or by TERCOR.sml.

• Related: FAQs by Jack D (pdf)
• Correct for Terrain Induced Radiance Effects
• Requires SRFI rasters and PVI and PBI pair.
• Requires knowing the image source.
• Requires the existence of a SHADING raster (made by TNTmips Slope, Aspect, Shading process).
• Output is a set of terrain-slope-aspect-corrected SRFI rasters plus a related PVI & PBI pair.

• Related: FAQs by Jack E (pdf)
• "Grand Unified Vegetation Index"
• Mapping Vegetation/Soil Biophysical Properties
• Requires pair of SRFI or SRFI-scaled rasters
• Optionally uses measured soil and vegetation characteristics
• Outputs: GRUVI (Vegetation Index raster) and GRUBI (Brightness Index raster)

• Related: FAQs by Jack F (pdf)
• Generalized Mapping of Biophysical Properties
• Requires SRFI-scaled multispectral image bands (4 to 9 spectral bands).
• Computes pre-defined or customized measures of biophysical properties using the Tasseled Cap transformation.
• Outputs: a set of Tasseled Cap biophysical measure rasters plus accompanying spectral distance rasters.

• Related: FAQs by Jack G (pdf)
• Color-Enhance Satellite Images of Coastal Areas
• Earth Imaging Journal: "Deep Water Ahead: Using Satellite Imagery for Underwater Mapping"
  Mapping submerged water features with satellite imagery requires an approach that differs from land mapping.
  http://www.eijournal.com/Deep_Water.asp
• Coast.rvc
• Performs specialized color enhancements for multispectral images of coastal areas, with separate treatment of shallow-water and land areas.
• Requires a set of four SRFI rasters (from SRFI.sml), namely, SRIFBL, SRIFGL, SRFIRL, and SRFINA).
• Combines an enhanced natural-color image of shallow-water areas with a choice of land image: natural color, color-infrared, or grayscale.
• Outputs: an IMAGE raster (24-bit color) that can be exported to an external format (e.g. GeoTIFF) for distribution as a value-added products.

• Related: FAQs by Jack G (pdf)
• Utility script to optionally improve the quality of the WATERMASK raster produced and used by WATER.sml.
• Requires a WATERMASK raster produced by a previous run of WATER.sml.
• Allows you to refine the separation between land and water to produce a better water-enhanced composite image.

• Related: FAQs by Jack H (pdf)
• Object Finding in Grayscale Images 
• This script produces three output products:
  1. A georeferenced Edge-Probability (EP) raster,
  2. A set of georeferenced vector Scene-Object Polygons (SOPs), and
  3. A text report.
• This script uses a single input raster; possibly a SRFI raster for a particular spectral band, such as SRFINA. Better yet, a Rin raster could be a Tasseled Cap (TC) raster from TASCAP.sml, e.g., TC Greenness. 

Coast.rvc: TNTlite-sized image extract from a QuickBird MS image acquired in the Florida Keys for use with WATER.sml.  The raw image bands in this file must be processed using SRFI.sml to scaled surface reflectance values first before running WATER.sml.  Parameters required for SRFI.sml are provided in a metadata text object in the file.  The image area near Key West includes urbanized and vegetated islands and shallow water of varying depth and differing proportions of bare sediment surface and sea grass.