ExportGeoJson()

Summary

Export entities in layer_set to filename

Syntax

ExportGeoJson(string lyr_set_name, string filename, array options)

Argument	Contents
lyr_set_name	The name of the layer or selection set to export
filename	A complete path and file name for the new geographic file.

Option	Type	Contents
Fields	Array	An array of field specs strings or null for no fields. Use field names only if there is no ambiguity when resolving field names in joined views or null for no fields
ID	Array	Field spec to be used for unique feature ID
Output Field Names	Array	(Optional) An array of the same length as Fields, with short field names that will be used in the output property names for each feature instead of the field specs
Output Headers	Boolean	"True" (default) to create the file from scratch and to include standard GeoJSON headers are included, or"False" to append the feature array to an existing file. The caller is responsible for writing the GeoJSON headers including the "features: [" line before calling ExportGeoJSON() and appending the closing "]" to the end of the file.
Include Whitespace	Boolean	"True" (default) means some minimal formatting is used, or"False" to omit white spaces and new lines, thus reducing the size of the output file
Centroids	Boolean	"False"(default) to export areas, or"True" to export the centroids of the areas are exported to a point GeoJson.
NAD Conversion	Boolean	Input datum, output datum, and conversion file (if needed); the input and output datums should be different
Projection	String	The projection name and the array of options
Transform	String	Array indicating the transformation to apply to coordinates in the file. This can have three forms:1. An array of two or more four-element arrays containing local and world coordinates for control points, for example, {{real localX1, real localY1, real longitude1, real latitude1}, ...}2. An array of four elements - {real X_multiplier, real Y_multiplier, real X_offset, real Y_offset}3. Center and Extent transform {c1_x, c1_y, width_1, c2_x, c2_y, width_2} where center is shifted from (c1_x,c1_y) to (c2_x,c2_y), and vector of length width_1 out of c_1 becomes a vector of length width_2 out of c_2.

Notes

Use CopyDatabase() to make an exact copy of a geographic file. Use ExportGeography() to create a smaller database from a selection set, or to convert between formats.
For more details on the NAD Conversion option, see Datum Conversions.

Example

SetLayer("County (Low Res)")

qry = "Select * where Population/Area > 100"

SelectByQuery("Selection", "Several", qry)

ExportGeoJson("County (Low Res)|Selection", "highdesn.json",{

{"Projection", "utm", {"zone=12", "units=m"}},

{"NAD Conversion", "NAD27", "NAD83",}

Error Codes

Error Type	Meaning
Error	An error occured while creating the geographic file (e.g., out of disk space)
NotFound	The specified layer or set name does not exist