IUCN provided online Maps (polygons) of species geographical range. I and my research group members could not find any way to calculate the area of the polygon in km square. If any one may have the solution!🙏
https://www.iucnredlist.org/species/3748/10051312
Please check the link to find a map of geographical range. How to calculate the area of each polygon in km square?
Dear Israel Sebsibe Tafesse
These links might be useful, have a look:
1. https://nc.iucnredlist.org/redlist/resources/files/1539098236-Mapping_Standards_Version_1.16_2018.pdf
2. https://www.iucnredlist.org/resources/spatialtoolsanddata
3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4411492/
Article Extending Marine Species Distribution Maps Using Non-Traditi...
Kind Regards
Qamar Ul Islam
Thank you, Sir, that is helpful, though, the file does not show any mathematical procedure.
The map is written in Leaflet.js, so in theory, you can maybe pull the JSON or GeoJSON information for the polygon. then measure it in ArcGIS or something similar. DM me if you want to talk this over.
Israel Sebsibe Tafesse I assume you don't have any sort of GIS, because area calculation is a stock feature. Data is from the IUCN link you provided, both extant and extinct habitat, area is square kilometer, area calculated using an Azimuthal Equidistant projection, and then sniff tested against the geodesic areas of administrative boundaries in the GADM. Shape file available on request.
Not sure what you mean by the file not containing 'mathematical procedure' - the shapefile has a mathematical spatial reference system defined with it ( WGS84 ) and that is sufficient to transform the vectors into a projected system of you choice. I probably could have used https://en.wikipedia.org/wiki/Lambert_azimuthal_equal-area_projection instead of https://en.wikipedia.org/wiki/Lambert_azimuthal_equal-area_projection but the difference is negligible over the extent of the data, and I already had an Ethiopia model from a past map.
Sir, this is a very helpful and practical answer that I have ever got. I appreciate that.
Dear Michael John Patrick, would you help me with important steps (in picture or video) of the output you provided? If possible, please provide me with shape files of Eastern Africa.
INRE: "important steps' ... Uhmmm ... there are a lot of implicit and explicit important steps, and it depends where you are starting from in regards to knowledge, skills, and experience. From the information I have available, since there are hundreds of paths to the same result, from a one line cryptic GDAL/OGR command line script to various tools in the QGIS / ESRI ArcGIS toolboxes, the request is essentially equivalent to writing an undergraduate course curriculum in GIS.
My post mentions where I found the shapefiles. And if you don't have any experience in GIS, I wouldn't be doing you any favors, because GIS skills are core to any wildlife analytics these days.
There are hundreds of videos on the Internet describing how to do this for all the major GIS applications, and the home pages of the applications have extensive tutorials ( https://www.youtube.com/results?search_query=arcgis+geometry+attributes and https://www.youtube.com/results?search_query=qgis+geometry+attributes ), a few minutes on Google uncover these. Once you have made some sort of start using the available resources and downloaded the data, I'm more than happy to assist with specific questions that require my expertise - but there is no sense in duplicating other's efforts.
- Badges
- Science topic
- Similar topics
- Geoscience
- Cartography
- Mapping
- Maps