EarthScope Consortium

Brooks Mershon

Utilities

It would be great to figure out how to upload larger files to get the 1' EGM2008.

It is almost half a GB. I'll see if I can host it somewhere and download it in the notebook without it being an attached file. But the download will take time for sure and I'm guessing the computations will take a potentially very long time to do in the browser. Standby I'll get the file working.

Try downloading and running the whole notebook locally. Very neat how Observable packages up the whole runtime. That might be one way to make use of a huge file and run the notebook locally. I'm investigating ways to make use of EGM2008-1

I am not sure. This is one I can investigate. Perhaps Brooks has a clue?

Not sure what you want in this section. I'll leave it alone for you to walk folks through things.

I'm bringing back a few of the calculations I made that I had so I can validate the part of the calculation that is not in your notebook

I could figure out how to get the initial value above plotted onto this map.

I need to edit the longitudes to allow for longitudes up to 360, or note that the longitudes should be +/-180

The projection library being used here is going to expect the +-180 interval. I'd recommend a note and if necessary we implement a function that transforms values outside the interval to the corresponding values they should be in the [0, 360] interval.

I was wrong! It already corrects for the +-180 and 0-360  - sorry for the false alarm!

NOTE: this starts to choke on large CSV files, e.g., ~1M rows (see: https://earthscopeconsortium.atlassian.net/browse/DH-1003). It would be good to explore:
1) Better warning messages about large files.
2) other methods of loading large user input data sets, like chunking/streaming, local browser Blobs/File, Shape Files, etc.
    See: 
    https://observablehq.com/@alandelip/file-loading-techniques
    https://developer.mozilla.org/en-US/docs/Web/API/FileReader
3) We should look at trying to setup this calculator server side (to also be used as a web service) to perform these calculations. The old Geoid Height Calculator ran server side and could be invoked like a web service.

Jim Riley

Plz change "elevation" to "ellipsoid height"

Beth Pratt-Sitaula

Sync text between below text box and here, you are collecting 
Longitude,Latitude,Ellipsoid Height 
not
Latitude,Longitude,Ellipsoid Height

Mladen Dordevic

I added in the cubic parameter so the checkbox input impacts the calculations. Was defaulting to false/off for cubic interp before.

Based upon map, are Latitude and Longitude columns labels mislabeled/swapped?

Looks like you fixed map plot, it looks more like it should (https://upload.wikimedia.org/wikipedia/commons/3/3b/Earth_Gravitational_Model_1996.png), 90 deg rotated then before. 

Numbers in the first column of the table are Longitudes not Latitudes based upon markers on the map. Relabel the first column