wgs84-raster-util


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