All Questions
14 questions
1
vote
2
answers
177
views
Tell GeoPandas the number of significant figures to use when writing GeoJSON geometries
I have a GeoDataFrame gdf. I write its contents to a GeoJSON:
gdf.to_file("example.geojson")
which works. However, each geometry is specified to 16 significant figures, which is an overkill ...
- 2,692
1
vote
1
answer
345
views
Options for precise relative position calculations
I'm investigating an industrial application that has a requirement to calculate with precision the relative distance on the ground between two outdoor points in the following scenario:
The first ...
- 119
3
votes
1
answer
7k
views
How precise is GPS?
Most search results I get on this talk about the accuracy, that is how close the locations outputted by the GPS are to the real positions, of GPS. However, I'm working on a project that only requires ...
- 31
2
votes
0
answers
1k
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define a precision accuracy QGIS project
How to define a precision accuracy of decimal places in QGIS project or where I use digitizing to add new features ?
for example I have a point or polygon and true coordinates of vertex have to many ...
- 1,061
1
vote
0
answers
583
views
How to validate high precision GPS systems location [closed]
I am currently working with a high precision RTK-GPS system which claims to be able to reach centimetre level accuracy, I am looking for a way to validate that it is actually reaching that precision ...
1
vote
0
answers
4k
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How much is the error in physical longitude and lagitude (e.g. meters) corresponding to a +-0.0001 error in GPS coordinates?
If I have a device how give-me a latitude and longitude with 7 decimals (eg. -42.5124478, -22.3006726, longitude and latitude respectively ) and I round it to 4 decimals (eg. -42.5124, -22.3007).
It ...
- 338
1
vote
1
answer
72
views
Transfer from Android phone to Windows OS truncates lat long
I am clicking GPS enabled pictures of sites which are less than 500 metres apart through Android based Samsung ACE Duos phone. I later use Google Earth on my Laptop to view these geo tagged pictures. ...
- 11
2
votes
3
answers
262
views
Is this distribution of GPS positions caused by multipath distortion?
I have some GPS points that are close to where they should be, but not nearly close enough (horizontal precision is around 10 meters). Looking at the positions which comprise these points (there are ...
- 12.3k
3
votes
2
answers
133
views
Compensating lat/long offsets after conversions
In my application I am doing conversions between two different formats of data.
First format is a simple one containing NE and SW coordinates for a given rectangular area:
area = {
"sw": {
...
- 33
12
votes
2
answers
23k
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Low-cost centimeter-level accurate satellite positioning (GNSS/GPS) [closed]
I am looking for a low-cost (< US$500) GNSS/GPS setup with a centimeter precision without much HW hacking. I am not able to produce my PCB or do any soldering (though I would do that if there is no ...
- 561
7
votes
3
answers
4k
views
Accuracy vs Precision GPS
I am doing some research on consumer grade GPS accuracy and precision. I took 5 readings for 20 known locations (100 readings). Am I correct in assuming that the standard deviation between the 5 ...
- 1,660
2
votes
1
answer
191
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What is a reasonable time to get a gps fix with 10 meters precision?
I hope I'm asking this at the right part of Stack Exchange. Please bear with me if I'm wrong.
I'm developing some gps based applications. The demands I have for precision are not very high, but I need ...
- 123
7
votes
1
answer
2k
views
Need to learn more about Precision and Accuracy
I am currently taking Introduction to Image Interpretation online and there is a section in it that talks about Precision and Accuracy. I wanted to know if someone out there has any good information ...
- 4,139
612
votes
7
answers
591k
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Measuring accuracy of latitude and longitude
I have latitude and longitude as 19.0649070739746 and 73.1308670043945 respectively.
In this case, both coordinates are 13 decimal places long, but sometimes I also get coordinates that are 6 decimal ...
- 6,247