Scientific discipline dealing with the measurement and representation of the Earth's shape and gravitational field.

learn more… | top users | synonyms

1
vote
1answer
487 views

What datum (reference ellipsoid) does Nasa Worldwind use?

What datum (reference ellipsoid) does Nasa Worldwind use? I can't seem to find where Nasa Worldwind tells explicitly what datum they use. I need some sort of valid link.
2
votes
0answers
795 views

Which of EGM96 geoid or WGS84 ellipsoid fits the earth better?

ImageCredit Question If we separately add up |H| and |h| over the earth surface, which of the sums come out smaller? Background There is a phrase in the tag description of "ellipsoid" that says ...
1
vote
0answers
11 views

Reverse Calculate Ellipsoidal Height

I have a few hundred points with ellipsoidal height taken a few years ago. Based on these ellipsoidal heights I had deduced orthometric heights for the same. Is there a way to find the ellipsoidal ...
1
vote
0answers
61 views

Strategies and methods that Datums and Coordinate Systems use to account for movement of the earth's surface

Are there datums and coordinate systems that address the issue of shifting coordinates through time? If so, what are some of the strategies and methods that the datums and coordinate systems use to ...
1
vote
0answers
344 views

Intersection between a ray from lat, lon, alt, with pan, tilt and earth's surface

I have a problem that consists of finding the intersection point between a ray from a given lat, lon, alt, that is looking to a given pan and tilt angles and the earth's surface. I need the lat, lon ...
1
vote
0answers
124 views

How do I account for changing latitude with a spatial filter?

I'm working with data in latitude/longitude grid form in a non-GIS specialised package (MATLAB) and wish to apply spatial filters to it. As this data contains a broad range of latitudes and is ...
0
votes
0answers
8 views

Using UTM Projection with Local Datums

Can somebody answer me is it okay to use UTM 42N Zone with Local Datum Everest 1830 (with applied transformation)in RTK Survey whereas UTM Projection is a default projection of WGS84 Datum.Will it ...
0
votes
0answers
61 views

how to apply a canvas 'grid' to leaflet without curvature

I'm trying to create a grid of tiles in canvas to represent some data the original data comes with UK OSEAST1m and OSNORTH1m, i'm the grouping the data up into aggregates of, say 40km (as per the ...
0
votes
0answers
345 views

Trilateration Calculation Issue

edit I was able to do this following partially from this solution: How to calculate the intersection of 2 Circles? I broke it up into 3 groups of intersections AB, AC and BC. Once I had those I took ...
-1
votes
0answers
15 views

Get geographical coordinates from these ones

Can't seem to able to identify what type of coordinates do these belong to: 9610346,87 E 5235025,08 N They seem like cartesian coordinates, but online converter converts them like this: ...