Geographic utilities for manipulating raster graphics using WGS84 datum
Installation
$ npm install wgs84-raster-util
Methods
cellSize(NWRowCornerCoord, SWRowCornerCoord, rasterHeight)
NWRowCornerCoord: object, GeoJSON point for the NW corner of the raster
SWRowCornerCoord: object, GeoJSON point for the SW corner of the raster
rasterHeight: number, raster height in pixels
Returns
number, square size of a cell in meters
rowBounds(NWRowCornerCoord, NERowCornerCoord, cellSize, rowIndex)
NWRowCornerCoord: object, GeoJSON point for the NW corner of the raster
NERowCornerCoord: object, GeoJSON point for the NE corner of the raster
cellSize: number, square size of a cell in meters
rowIndex: number, index of current row starting at 0
Returns
array, coordinates of a bounding polygon for the row
cellBounds(NWRowCornerCoord, SWRowCornerCoord, cellSize, colIndex)
NWRowCornerCoord: object, GeoJSON point for the NW corner of the row
SWRowCornerCoord: object, GeoJSON point for the SW corner of the row
cellSize: number, square size of a cell in meters
colIndex: number, index of current column starting at 0
Returns
array, coordinates of a bounding polygon for the column
pointCell(extent, rasterDimensions, pointCoord)
extent: array, bounding box coordinates in the form: [xLow, yLow, xHigh, yHigh]
rasterDimensions: object
- width: number, discrete units for row size
- height: number, discrete units for column size
pointCoord: object, GeoJSON point
Returns
object, GeoJSON point containing cell coordinates referenced by
pointCoord
Running Tests
Install the development dependencies:
$ npm install
Then run the tests:
$ npm test
Code Coverage
Install the development dependencies:
$ npm install
Then run coverage
$ npm run coverage
View coverage reports
$ firefox coverage/lcov-report/index.html
Browser Bundle
$ npm run build