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Geometries corresponding to FSIDs #42

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SIGGRUV opened this issue Jan 19, 2021 · 2 comments
Open

Geometries corresponding to FSIDs #42

SIGGRUV opened this issue Jan 19, 2021 · 2 comments

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@SIGGRUV
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SIGGRUV commented Jan 19, 2021

I am having a difficult time understanding how to link the FSIDs to polygons. What I have in mind is that I want to download a shapefile or a list of geometries of given flooded areas in a particular city, have ArcGIS Pro (preferred) or QGIS construct polygons based on the flood area shapefiles or geometries, and then append to the attribute table of those polygons the relevant information for my work, such as flood depth, based on shared FSIDs. I have already generated a list of FSIDs located within the city boundary. I have no problem downloading the relevant flooding data by FSID. But how do I go about downloading polygon information to relate it to? Or am I just completely misunderstanding the architecture/function of the FirstStreet data?

Looking through the unresolved issues and the resolved issues, people who asked similar questions were directed to view flooding tiles in QGIS or ArcGIS's online interface. However, from my understanding, this does not help me because I cannot download the tile data displayed in either interface. Further, I cannot download tile data based on FSID because tile data queries require a location tuple, and after reading through the documentation here, I cannot figure out a way to link a given FSID or set of FSIDS to a particular tuple or set of tuples, respectively.

Thanks in advance for your time and patience.

@Lyetenth
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Hey @SIGGRUV,

We've been looking into this, and were wondering if you could supply us with a sample FSID of the geometries you wanted to extract. We'll try to get a tile for you and see if it's what you're expecting. Please submit a sample FSID to the Google Drive link: Flood Lab folder

In the meantime, you can try using the Tile product to download the layers, and match them up with the Mercator projection. The coordinates used in that product are based on the google map's coordinates tile coordinates. You can use this link to convert a location to a (X, Y , Z) coordinate used in the Tile product.

@pranjalirai
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@SIGGRUV May I ask how you generated the list of FSIDs within the city boundary. I am trying to do the same for a county. Thanks

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