Command: project

Syntax

project { <elist> ... } | <points>

Description

Apply mapping projections to entities or points.

Parameters

• <elist>
  A group/entity list defining which entities are to be projected. If omitted, the current contents of the these group are projected.

• <points>
  A point identifier (scalar or array) whose co-ordinates are to be projected.

Switches

• -ef=<filter>
  A filter to be applied to all entities within <elist>, further qualifying which entities are to be projected. If omitted, the filter current_filter is used.

• -from=<projection>
  A projection defining the current projection of the entities (or points). If omitted, the current projection mapping is used. Use the phrase -from=ll_proj to convert from longitude/latitude.

• -to=<projection>
  A projection defining the new projection for the entities (or points). If omitted, the current projection mapping is used. Use the phrase -to=ll_proj to convert into longitude/latitude.

Notes

Sub-entities of compounds may be manipulated in isolation from their parent entities.

The from projection must be one with an inverse procedure.

Examples

Project all entities in the these group.

project -from=amg55, -to=amg56

Project two entities into the current projection.

project fred, my.face, -from=merc_10

Read from file and project an array of points.

point pps[]
pfile myfile.dat,-op=pps
project pps,-from=ll_proj,-to=ukng

See Also