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Math Help - Changing Pixel quanty to hectares on a 1:10000 map

  1. #1
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    Changing Pixel quanty to hectares on a 1:10000 map

    Hey,

    I just had a question regarding changing a pixel quantity to a unit of measurement.
    Previously, on 1:50000 maps, to change the number of pixels to hectares I multiplied the value of pixels by 0.25, because one pixel was 0.25 hectares. The data I was using was a 50m Digital terrain model, 50*50=2500 which = 0.25 hectares

    Now on a 1:10000 map, Im unsure of what to times the pixel value by to get a value in hectares. The model is a 10m, so 10*10=100, so i should times my answer by 0.01 right? but that doesnt give the value I want, is that correct though?

    Thanks
    Last edited by mr fantastic; May 19th 2011 at 05:31 AM. Reason: Restored deleted question.
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  2. #2
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    Now on a 1:10000 map, Im unsure of what to times the pixel value by to get a value in hectares. The model is a 10m, so 10*10=100, so i should times my answer by 0.01 right?
    That seems correct.

    but that doesnt give the value I want
    What value do you want?

    When you were using 1:50000 maps, you say that 1 pixel on the screen corresponded to 50 m on the terrain. Since 50 m = 50 000 mm, this means that 1 pixel on your screen takes 1 mm, which is too much. A typical screen resolution is 96 pixels/inch, which is about 3.8 pixels/mm.

    Could it be that you are using different zooms to show maps on your screen?
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  3. #3
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    actually, ive just realised what i was doing was already right and i was just overcomplicating it. thanks for your help
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