# Tag Info

## New answers tagged wgs84

5

I'm not really sure but maybe check if you meant EPSG 4326 instead of 3857.

0

If a coordinate reference system (CRS) identifies itself as an ellipsoid (spheroid in Esri-speak) and there's no datum information, there are no available transformations. Ellipsoids are used for multiple datums and geographic CRS. If you have the area of interest, you can find out what geographic CRS have been used in the area. If there are multiple ones, ...

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What is the epsg code of your data that ArcGIS recognizes? It should be 4024 for the Krasovsky ellipsoid without datum. Try to set it to the data if it is not recognized and have a look if ArcGIS has a transformation then. Otherwise it would be best to have a look for reference points when you are not sure about the correct positions. The ellipsoid, ...

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You can use the KD-tree based method that you propose. I've split the answer into two parts, addressing your questions about projection and how to interpolate with the KDTree. Projection Provided that the SMOS and SMAP datasets are in a cylindrical projected coordinate system, you will need to first convert them to longitude and latitude to use the linked ...

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I know it is dated in May but if you don't reproject it to UTM NAD 83, then your ArcMap will run very slowly !! so if you reproject then it will run smoothly and I agree with Christina as well.

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The normal to the ellipsoid is the vector orthogonal to the tangent to the ellipsoid at that point. This will not point to the center of the earth except at the equator and the poles. The gravity vector is orthogonal to the geiod and varies from the ellipsoidal normal by an amount called the deflection of the vertical. Which is usually expressed in the ...

1

This model assumes the world is spherical, but earth's radius changes with the latitude. If the distance covers about 1/10 of a degree, and Earth's radius ranges from 6353-6384km, then the error can be over 400m. This might cause 10km to come out as 9km if you are aggressively rounding.

2

For javascript you can use proj4.js. Its conversion function is called proj4.

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