shpFile

Very simple ESRI SHP file to GeoJSON convertor. In fact parse subset of ESRI SHP. Now parsed next type of shapes:

• 0 Null shape
• 1 Point
• 3 PolyLine
• 5 Polygon
• 8 MultiPoint
• 11 PointZ
• 15 PolygonZ

Installation

npm install --save https://github.com/mvtm-dn/shpFile.git

usage

Example of usage:

    const shapeFile=require("shpFile");

    let geoJSONs=[];
    shapeFile(filename).on("error",(error)=>{
        console.log("Error open %s - %s",filename,error);
    })
    .on("end",(shapes)=>{
        console.log("Got %d shape(s)",shapes.length);
        for(let i=0;i<this.length;i+=1) {
            geoJSONs.push(shapes.toGeoJSON(i));,
        }
    });
    

shapeFile object

methods

shapeFile(sources[,translate[,filter]]) Create parser object and start parsing shape file. Parameters

• sources - either name of shape file or list ["name of shape file", "name of dbf file"]
• translate - proj4(..) instance. Can be omitted.
• filter - filter expression. If filter(shape)===false then shape don't append at resulting list

length - returns numbers of readed objects toString() - returns string representation of shape file as a javascript Object toGeoJSON([index]) - returns GeoJSON representation of either of one of shape file object or all shapefile objects.

events

error - emitted when the any error throws during parsing file. Passes along throwed error end - emitted when shapes successfully parsed. Passes along shapeFile object reference.

shapes

shapeObject.shapes is an array of parsed shapes.

Field	Value	Present in
type	type of shape	0,1,3,5,8,11,15
points	array of points	1,3,5,8,11,15
bbox	bounding box	3,5,8,15
parts	list of parts	3,5,15
z	z value	11
z	array of z values	15
m	m value	11
zmin,zmax	zmin and zmax	15

TODO

TODO List

• Extract m values for polylineZ
• Parse rest of shape types