Bitmaps are digital images, typically an image of a map, drawing or aerial photograph.\u00a0 These can be loaded into NoiseMap\u00a0to provide a background to a noise model or noise contours\u00a0which can be overlaid onto them.\u00a0 It is also possible to create a model by\u00a0tracing over the bitmap image in NoiseMap.<\/p>\n
In order for the bitmap to appear in the right position on the noise model, it must be ‘calibrated’, which is a process of adding its co-ordinates and scale.\u00a0 NoiseMap provides a tool for adding this calibration.<\/p>\n
Some bitmaps are already supplied with their co-ordinates so do not require calibration.\u00a0 These are sometimes called ESRI ArcView ‘World’ files and are supplied in two parts, the ordinary\u00a0bitmap (which has the suffix .bmp)\u00a0and a calibration file with\u00a0the suffix .bpw<\/p>\n
Pictures in jpeg format cannot be read directly by NoiseMap: they first need to be converted into .bmp files, which many photo editors can do.\u00a0 They may also be supplied with a ‘world file’ which has the suffix .jpw.\u00a0 It is usually possible to use this ‘world file’ with the .bmp file simply by changing the suffix from .jpw to .bpw and loading this into NoiseMap.<\/p>\n","protected":false},"excerpt":{"rendered":"
Bitmaps are digital images, typically an image of a map, drawing or aerial photograph.\u00a0 These can be loaded into NoiseMap\u00a0to provide a background to a noise model or noise contours\u00a0which can be overlaid onto them.\u00a0 It is also possible to create a model by\u00a0tracing over the bitmap image in NoiseMap. In order for the bitmap … Continue reading Data importing from Bitmaps<\/span>