pix2vec

Geospatial Vector Representation of Planetary Remote Sensing Hyperspectral Data

pix2vec: Vector Representation of Planetary Hyperspectral Data Cubes

Free software: GNU General Public License v3
Documentation: https://pix2vec.readthedocs.io.

Features

Produces a vector representation of the raster representation of HSI data ‘cubes’ generated by ISIS

Requirements

a relatively recent Integrated Software for Imagers and Spectrometers (ISIS) installation and the kalasiris module (which will be installed automatically).

Cite in your work

Frigeri, A. and Hare, T. 2023. Geospatial Vector Representation of Planetary Mapping Spectrometer Data. 6th Planetay Data Workshop, Flagstaff, Arizona 26-28th June 2023, Abstract #7088.:

@INPROCEEDINGS{FrigeriHare2023,
      author = {{Frigeri}, A. and {Hare}, T.},
       title = "{Geospatial Vector Representation of Planetary Mapping Spectrometer Data}",
   booktitle = {6th Planetay Data Workshop},
        year = 2023,
      series = {LPI},
       month = jun,
         eid = {7088},
       pages = {7088}
}

installation

within a working ISIS environment, run:

pip install pix2vect

pix2vec in brief

pix2vect requires spice-initialized ISIS cubes (see spiceinit).

Let’s start with an hyperspectral cube from the The Moon Mineralogy Mapper (M3), the NASA spectrometer onboard Chandrayaan-1 mission to the Moon:

(ISIS) $ pix2vec -i -c M3G20090103T084105_V03_L1B.cub
pix2vect - 2023 Alessandro Frigeri - Istituto Nazionale di Astrofisica
Cube Type:M3 samples:304 lines:11739 file:M3G20090103T084105_V03_L1B.cub

now we create a vector GIS file representing the geometry of the sensor’s pixel on the lunar surface:

pix2vec -c M3G20090103T084105_V03_L1B.cub -s 1,150 -l 3050,3200 -o M3G20090103T084105_V03_L1B_subset.gpkg

the vector file can then be loaded in your favorite GIS, and we can plot the file with a PixelValue greyscale:

each ground pixel element holds information that can be accessed:

for each ground-projected pixel, you now have access to these fields:

Filename Sample Line PixelValue RightAscension Declination
PlanetocentricLatitude PlanetographicLatitude PositiveEast360Longitude
PositiveEast180Longitude PositiveWest360Longitude PositiveWest180Longitude
BodyFixedCoordinateX BodyFixedCoordinateY BodyFixedCoordinateZ LocalRadius
SampleResolution LineResolution SpacecraftPositionX SpacecraftPositionY
SpacecraftPositionZ SpacecraftAzimuth SlantDistance TargetCenterDistance
SubSpacecraftLatitude SubSpacecraftLongitude SpacecraftAltitude OffNadirAngle
SubSpacecraftGroundAzimuth SunPositionX SunPositionY SunPositionZ
SubSolarAzimuth SolarDistance SubSolarLatitude SubSolarLongitude
SubSolarGroundAzimuth Phase Incidence Emission NorthAzimuth EphemerisTime UTC
LocalSolarTime SolarLongitude LookDirectionBodyFixedX LookDirectionBodyFixedY
LookDirectionBodyFixedZ LookDirectionJ2000X LookDirectionJ2000Y
LookDirectionJ2000Z LookDirectionCameraX LookDirectionCameraY
LookDirectionCameraZ ObliqueDetectorResolution ObliquePixelResolution
ObliqueLineResolution ObliqueSampleResolution Error

Documentation

Documentation is available at https://pix2vec.readthedocs.io