File formats for SlantView's data exports: GeoTIFF, KMZ, Shapefile
- GeoTIFF: GeoTIFF stored as uint8 values.
- KMZ: Google Earth file containing the data layers selected from the Processing settings menu.
- Shapefile: .shp, .dbf, .shx, shapefiles containing the data layers selected from the Processingsettings menu.
Population Analysis Map Products
- Plant Population Density:
The population value = 1.5 x the uint8 value (0-255) x the value coded as a float in the 2nd 4 bytes of TIFFTAG_SR_MAPSCALE (65005); and, where the units of the population are coded in the 3rd 4 bytes of TIFFTAG_SR_MAPSCALE (65005) as: 4 = per sq meter, 5 = per acre, 6 = per hectare, 7 = per sq km, 8 = per sq statute mile.
2. Plant Size Distribution:
0-255 uint8 space scales to 0.0 - 1.5, where 1.0 is the 75th percentile of the median plant size.
Stress Analysis Map Products
This is a 345-acre field of early season Brazilian corn at approximately V5-V6. One of our customers sampled an 90-acre section in the southern quarter of the field. While NDVI and color imagery shows this to be a field of fairly uniform condition, the vegetation fraction measurement shows substantial variability in biomass which dominates the yield potential data product.
The 6-page GeoTIFF saved for Stress Analysis:
- Vegetation Stress - 0-255 uint8 space scales to 0.0 - 1.0 relative stress condition (proprietary formula)
- Vegetation Fraction - 0-255 uint8 space scales to 0 - 100% canopy closure
- Yield Potential - 0-255 uint8 space scales to 0 - 100% relative potential (proprietary formula)
- Green NDVI (850 - 550) / (850 + 550), 0-255 uint8 space scales to 0.0 - 1.0
- Red NDVI (850 - 650) / (850 + 650), 0-255 uint8 space scales to 0.0 - 1.0
- Red-edge NDVI (850 - 710) / (850 + 710), 0-255 uint8 space scales to 0.0 - 1.0
- If applicable: Custom area density, 0-255 uint8 space scales to 0 - 100% of ground covered by signal type
SlantView exports two kinds of shapefiles, both polygon type.
One is the contour or custom boundary created in map window - which can be exported into a shapefile.
Another is the map export into shapefile:
When a map is selected for export into a shapefile, it is broken down into square boxes (5x5 m, IIRC). Each box is exported as a separate polygon, with four Lon/Lat coordinates of the corners. If a single map is exported into a shapefile, the database file will contain the name of the values for each polygon and the values themselves (mean value for the 5x5 meter area). If multiple maps are exported into a shapefile, the database file will contain the values (5x5m block averages) and names of all map entries.
Output format: four files with the same prefix are exported: SHP (file containing the polygon vertices themselves) SHX (file containing the index of SHP file) DBF (database file containing values and names of entries in SHP file) PRJ (projection file containing information about how to interpret the polygon vertices' coordinates).
Neither file has any way to propagate drawing attributes to GIS software (line thickness/color, fill color, transparency, etc.) - it falls to the GIS software to either automatically assign the graphical attributes to the shapefile entries by value, or offer the user a way to assign them