Convert Vector to Raster - Projected Coordinate System (X and Y) but NOT Geographic Coordinate System (lat and lon)

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Claudia 2012-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/37830-convert-vector-to-raster-projected-coordinate-system-x-and-y-but-not-geographic-coordinate-syste

I have polylines in a projected coordinate system (X and Y). I would like to convert these vector data to raster data.

I used 'vec2mtx' but get errors because my projected values are NOT within -90 and 90 or −180 and 180]. My values are around 510000 for X (False_Easting) and 6023150 for Y (False_Northing)

I tried to fix vec2mtx but it did not work.

Is there another function, tool or whatever which I can use? Do you have any idea how to convert vector projected map data to raster data?

Thanks a lot, any suggestion is more than welcome

Cheers

Claudia

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Walter Roberson 2012-5-9

MATLAB is not designed to store values by bits; the storing and retrieving has to be done mathematically or by using the bitset() and bitget() calls (which tend to be slow.) The smallest logical data type in MATLAB is "logical", but that is presently implemented at one value per byte (except I think I saw one special case might internally be stored at 8 logical per byte.)

How dense are you expecting the result to be? 25000 lines on a grid that size doesn't sound like much at first thought. If you expect a lot of empty area, then using a sparse array of logical might be suitable.

Box counting... that sounds to me as if it could be done piece-wise? If you were to divide the logical output grid into a number of tiles, and do the drawing one tile at a time, then could that be productive? I suppose you might need an overlap area if the boxes are sliding smoothly.

Do you have an estimate for the longest straight line segment (in meter) ? The shorter the lines are, the more effective preprocessing can be at reducing the cost of constructing fine details for a section.

Walter Roberson 2012-5-10

Why not divide the data by 10^5 to get it into the range accepted by vec2mtx ?

Claudia 2012-5-11

Hi Walter

Good idea - and quite obvious - wonder I did not think on it :-)

Just tried it. But still it does not work ...

I tried vec2mtx with an example data and it ran. I could not find any difference between the example data and my data. Will check the functions and the data again ... hopefully I find sth.

However, thank you very much for your help.

Claudia

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