From Wikipedia: In computing, floating point describes a method of representing an approximation to real numbers in a way that can support a wide range of values. The numbers are, in general, represented approximately to a fixed number of significant digits (the mantissa) and scaled using an ...
19
votes
2answers
340 views
Precision when working with spatial data in GIS
Is there a basic or introductory study that examines and compares the precision of spatial data when working
with varying precison of the data input, like having 1, 2, ... decimal places?
with the ...
7
votes
1answer
385 views
In ESRI ArcMap, how do I refer to NaN or ±∞ (special floating point values) in definition queries?
I have by chance discovered how ESRI ArcMap displays special floating point values to the user.
+∞ (positive infinity) is displayed as 1.#INF
–∞ (negative infinity) would supposedly be displayed as ...
6
votes
2answers
752 views
How to fully load a raster into a numpy array?
I have been trying to check my filters on DEM raster for pattern recognition and it is always resulting in missing last rows and columns(like..20).
I have tried with PIL library, image load. Then with ...
5
votes
1answer
116 views
How can I snap lines in PostGIS?
I have a few linestrings that together form a long line. The start- and endpoints of the linestrings are equal with their direct neighbour, but when tested the ST_Distance between any 2 lines is like ...
2
votes
4answers
253 views
Floating point: understanding their inaccuracy [closed]
I am trying to understand why a floating point is inaccurate. Please bear in mind that I am not a mathematician.
What is exactly the difference between floating point and double integers? and why use ...
1
vote
3answers
67 views
How can I reclassify a raster to floating point values?
I have a raster of landuse values that I need to reclassify into pollution concentration values. I have the pollution values in a separate table. They are decimal values (ex. 0.0056), and my landuse ...
