ProjPicker (projection picker) allows the user to select all projections whose extent completely contains given points, polylines, polygons, and bounding boxes. The goal is to make it easy and visual to select a desired projection by location.
Project description
ProjPicker
ProjPicker (projection picker) allows the user to select all projections whose extent completely contains given points, polylines, polygons, and bounding boxes. The goal is to make it easy and visual to select a desired projection by location.
It is a work in progress. Read a related feature request for GRASS and join discussions.
The single Python script projpicker.py
provides the CLI and API for
ProjPicker.
The rtree-oop branch utilizes the rtree module in an object-oriented programming (OOP) way. This branch supports point intersection.
Requirements
Tested with PROJ 7.2.1 in Python 3.7.2
Requires the PROJ database (e.g., /usr/share/proj/proj.db
) and the following
standard modules:
- argparse
- os
- sys
- sqlite3
- re
- json
- pprint
- math
Installation
pip3 install projpicker
If you want to run projpicker.py
from the shell, add
lib/pythonX.Y/site-packages/projpicker
to PATH
or create a wrapper Python
script ppik.py
in PATH
:
#!/usr/bin/env python3
import projpicker as ppik
ppik.main()
Just don't copy projpicker.py
to PATH
because it will look for the
projpicker.db
file in the same directory and fail to find it. Also, the name
of the warapper script must be different from projpicker.py
because you don't
want to import the warapper itself as the projpicker module.
Command-line usage
usage: projpicker.py [-h] [-c] [-O | -a] [-d PROJPICKER_DB] [-p PROJ_DB]
[-g {point,poly,bbox}] [-q {and,or,all}]
[-f {plain,pretty,json}] [-n] [-s SEPARATOR] [-i INPUT]
[-o OUTPUT]
[geometry [geometry ...]]
ProjPicker finds coordinate reference systems (CRSs) whose bounding box
contains given geometries; visit https://github.com/HuidaeCho/projpicker for
more details
positional arguments:
geometry query geometry in latitude,longitude (point and poly)
or s,n,w,e (bbox); points, points in a poly, or bboxes
are separated by a space and polys are separated by
any non-coordinate character such as a comma
optional arguments:
-h, --help show this help message and exit
-c, --create create ProjPicker database
-O, --overwrite overwrite output files; applies to both projpicker.db
and query output file
-a, --append append to output file if any; applies only to query
output file
-d PROJPICKER_DB, --projpicker-db PROJPICKER_DB
projPicker database path (default: projpicker.db); use
PROJPICKER_DB environment variable to skip this option
-p PROJ_DB, --proj-db PROJ_DB
proj database path (default: /usr/share/proj/proj.db);
use PROJ_DB or PROJ_LIB (PROJ_LIB/proj.db) environment
variables to skip this option
-g {point,poly,bbox}, --geometry-type {point,poly,bbox}
geometry type (default: point)
-q {and,or,all}, --query-mode {and,or,all}
query mode for multiple points (default: and); use all
to list all bboxes and ignore geometries
-f {plain,pretty,json}, --format {plain,pretty,json}
output format
-n, --no-header do not print header for plain output format
-s SEPARATOR, --separator SEPARATOR
separator for plain output format (default: comma)
-i INPUT, --input INPUT
input geometries path (default: stdin); use - for
stdin; not used if geometries are given as arguments
-o OUTPUT, --output OUTPUT
output path (default: stdout); use - for stdout
Creating the ProjPicker database
From the shell,
projpicker.py -c
From Python,
import projpicker as ppik
ppik.create_projpicker_db()
Querying points
From the shell,
# read latitude,longitude from arguments
projpicker.py 34.2348,83.8677 33.7490,84.3880
# read latitude,longitude from stdin
projpicker.py <<EOT
34.2348,83.8677
33.7490,84.3880
EOT
From Python,
import projpicker as ppik
bbox = ppik.listify_bbox(ppik.query_points([[34.2348, 83.8677],
[33.7490, 84.3880]]))
Querying polylines/polygons
From the shell,
# read latitude,longitude from arguments
projpicker.py -g poly -- -10,0 10,0 10,10 10,0 , 10,20 30,40
# read latitude,longitude from stdin
projpicker.py -g poly <<EOT
# poly 1
-10,0
10,0
10,10
10,0
# poly 2
10,20
30,40
EOT
From Python,
import projpicker as ppik
bbox = ppik.listify_bbox(ppik.query_polys([[[-10, 0], [10, 0],
[10, 10], [10, 0]],
[[10, 20], [30, 40]]]))
Querying bboxes
From the shell,
# read s,n,w,e from arguments
projpicker.py -g bbox 0,0,10,10 20,20,50,50
# read s,n,w,e from stdin
projpicker.py -g bbox <<EOT
0,0,10,10
20,20,50,50
EOT
From Python,
import projpicker as ppik
bbox = ppik.listify_bbox(ppik.query_bboxes([[0, 0, 10, 10], [20, 20, 50, 50]]))
TODO
- GUI
- ArcGIS Pro Toolbox for ArcGIS users including IESA students? Will be easier to implement because ArcGIS Pro provides nice pencil tools and mapping functionalities. We'll be able to see almost immediate returns.
- Web
- Desktop
- CRS hints
- Crowdsourcing agency and product information?
Sponsor
This project is kindly funded by the Institute for Environmental and Spatial Analysis (IESA) at the University of North Georgia (UNG).
License
Copyright (C) 2021 Huidae Cho and Owen Smith
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
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