Visitation: the grids come out empty

[skclaros]

Hello, my name is Sandra and I write from Chile. I want to obtain the PUD of a polygon and have the data per grid or cell. I have tried various cell sizes, but nothing works. However, when I do not set the AOI option, I obtain data only by dates, that is, there are photos for the area, but I cannot obtain the data by cell. What will I be doing wrong? my file is in kml, but I also used shapefile, and the same thing comes out. The coordinates are in UTM and correspond to an area of Santiago in Chile.

I share the folder with the data and results that I have obtained.
https://drive.google.com/drive/folders/1uKnP-IY37-kC2sI8WJSUtysUvxpUyKwd?usp=drive_link

Thank you very much for the reply
Sandra

[dave]

Hi @skclaros , sorry for the delayed response.

Thank you for sharing your data. I can see that your AOI (Carbon_M_M.kml) has coordinates of decimal degrees (WGS84) and the following very small extent:

INFO: Open of `Carbon_M_M.kml'
      using driver `LIBKML' successful.

Layer name: carbon_manquehuito
Geometry: Unknown (any)
Feature Count: 1
Extent: (-159.236750, -85.525484) - (-159.236745, -85.525484)
Layer SRS WKT:
GEOGCRS["WGS 84",
    DATUM["World Geodetic System 1984",
        ELLIPSOID["WGS 84",6378137,298.257223563,
            LENGTHUNIT["metre",1]]],
    PRIMEM["Greenwich",0,
        ANGLEUNIT["degree",0.0174532925199433]],
    CS[ellipsoidal,2],
        AXIS["geodetic latitude (Lat)",north,
            ORDER[1],
            ANGLEUNIT["degree",0.0174532925199433]],
        AXIS["geodetic longitude (Lon)",east,
            ORDER[2],
            ANGLEUNIT["degree",0.0174532925199433]],
    ID["EPSG",4326]]

The cell size you provide to the model needs to have units that match the AOI coordinate system, in this case decimal degrees. But the extent of the AOI is so small, that no grid cells will fit within it, even for the very small cell sizes you may have tried.

The latitude dimension of the AOI is so small that the min & max values appear identical to 6 decimal places:
Extent: (-159.236750, -85.525484) - (-159.236745, -85.525484)

I’m guessing something may have gone wrong when creating that KML file. Perhaps you can go back to the original data source and create a new AOI? After you do, it’s a good idea to look at it in GIS overlayed on some reference data (basemap) so you can confirm the AOI represents the intended area.