MHL_ADM2 - Githubissues

UGA-ITOSHumanitarianGIS / mapservicedoc

Map Service Documentation and Tools Hosted by University of Georgia for Common Operational Datasets (COD) coordinated by UN OCHA and accessible through HDX, https://data.humdata.org and humanitarian data

https://codgis.itos.uga.edu/arcgis/rest/services

GNU General Public License v3.0

2 stars 0 forks source link

MHL_ADM2 #38

Open maxmalynowsky opened 3 months ago

maxmalynowsky commented 3 months ago

Layer: https://codgis.itos.uga.edu/arcgis/rest/services/COD_NO_GEOM_CHECK/MHL_pcode/FeatureServer/2

Proposed fix: https://data.fieldmaps.io/cod/originals/mhl.shp.zip

Issue: Unknown projection in meters but assigned as WGS84. Manual work done to fix but needs more work to align better with islands as there is still an offset to correct.

hayttom commented 2 months ago

Is this related to crossing the 180 degree meridian?

maxmalynowsky commented 2 months ago

No, it's an issue where the Spatial Reference has been incorrectly assigned. The dataset in HDX has this error too. If the dataset was really EPSG:4326 (WGS84), the Min/Max values should be -180/180 and -90/90 degrees. Here you see values in the millions, which suggests some kind of mercator (meter based) SRS. I can't remember which SRS I used to reassign the data to, I think I used a UTM. It got a ballpark result, but there was still a complex variable offset that I wasn't able to correct.