Map Numbers Resolution For Free

The dots per inch (dpi) parameter sets the resolution required. 72 dpi - usually enough for on-screen graphics. 150 dpi - good for large format printed maps, e.g. 24 in x 36 in. 300 dpi - good for small format printed maps, e.g. 8.5 x 11 or 11 x 17.

Resolution: The map resolution or ground resolution refers to the actual ground size (m) that a pixel represents. PPI, the screen resolution refers to the pixels number that every inch contains on the screen and the default is 96dpi (pixel/inch). 0.0254(m/inch) refers to the unit conversion between meter and inch.

In other words, map resolution is how finely the map is divided into small units, such as pixels or vector data, and how accurately those units represent the real world. For example, a map with a high resolution would have more detail and accuracy than a map with a low resolution.

Resolution: The map resolution or ground resolution refers to the actual ground size (m) that a pixel represents. PPI, the screen resolution refers to the pixels number that every inch contains on the screen and the default is 96dpi (pixel/inch). 0.0254(m/inch) refers to the unit conversion between meter and inch.

Each pixel is 30 meters on a size (an area of 900 square meters). You double that to get four pixels (two rows and two columns) with a resolution of 60 meters on a size (an area of 3600 square meters). Then you multiply that 60 meter resolution by 1000 to get a map scale of 60,000.

Other interpretations of resolution exist (pixels per inch, overall pixels in an image, how many megapixels), but they aren't as important in GIS data. Accuracy is how well the data reflects the earth it's mapping. We can see it when an image has low resolution: objects are blurry and difficult to discern.