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1answer
40 views

ECEF to relative displacement in meters

I have GPS NMEA (National Marine Electronics Association) data that I collected being stationary and I can see the displacement of 4 meters just by looking at GPX data uploaded to google maps. I am ...
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3answers
187 views

Latitude above and below the surface of the Earth

I know that Geodetic Latitude is measured with respect to the normal at a point on the surface of the reference ellipsoid. But what about points above and below the surface? Do they follow a ...
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0answers
24 views

Latitude of landmarks

I am new to mapping. Is there an online resource that lists both the geocentric and geodetic latitudes of various world landmarks?
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1answer
75 views

Oracle equivalent to postgis EPSG 4326 “geometry” type

We have polygons stored in Oracle SRID 8307 (geodetic datatype), but need to perform various operations on this layer in a 2d cartesian/non-geodetic system based on the geographic coordinates. I.e. ...
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1answer
86 views

Converting Korea 2000 coordinate system to WGS84?

I have coordinates in Korea 2000 EPSG:5181 projected coordinate system. Is there a way to make a formulation in excel to convert these coordinates to lat long (WGS84)?
0
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1answer
185 views

Can't get RTKLIB to use an external geoid

I want to write the results of processing a Rinex file using geodetic heights, and an external geoid from Spain's geographic institute IGN. I have downloaded the geoid files from their FTP in text ...
4
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2answers
259 views

Transformations OSTN02 to OSTN15

I have a collection of points in a .CSV which are currently in OSGB36 and have been through the OSTN02 transformation. I would like to put them through the OSTN15 transformation in bulk, using the ...
3
votes
0answers
182 views

How to determine the lat long of a point in the atmosphere which is 250 km altitude?

Regarding determination of coordinates of Ionospheric Pierce Point (IPP) S is the position of a geostationary satellite. E is the elevation angle. The radio signal ...
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1answer
150 views

What is the “Long-Wavelength Error” reported for SRTM data?

Assessments of SRTM topographic products (like Rodríguez et al 2005 and 2006) report that height errors showed coherent long-wavelength signatures and describe long-Wavelength error characteristics. ...
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0answers
58 views

Inconsistent coordinates of centroid were found using the given value of radius of curvature in the prime vertical and in the meridian

I am currently writing a function on geodetic datum transformation in Hong Kong by referring to the Explanatory Notes on Geodetic Datums in Hong Kong by the Survey & Mapping Office of the Lands ...
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0answers
87 views

Constructing geodetic lines

I am trying to construct a geodetic line between destinations. I have followed two guides without luck. This are the steps I've done: I created a polyline shapefile and named it "Distance" I went to ...
1
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1answer
264 views

Getting geodetic area from rgeos::gArea? [closed]

I need to get an area of different polygons at continental scale (like third of Africa etc.). Usual functions like rgeos::gArea work only in the projection units. Is there any function which works ...