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fudgeo-0.4.0
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مشاهده بیشترتوضیحات
GeoPackage support from Python. fudgeo is a simple package for creating OGC GeoPackages, Feature Classes, Tables, and geometries (read and write).
| ویژگی | مقدار |
|---|---|
| سیستم عامل | - |
| نام فایل | fudgeo-0.4.0 |
| نام | fudgeo |
| نسخه کتابخانه | 0.4.0 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | - |
| ایمیل نویسنده | "Integrated Informatics Inc." <contact@integrated-informatics.com> |
| آدرس صفحه اصلی | - |
| آدرس اینترنتی | https://pypi.org/project/fudgeo/ |
| مجوز | MIT License Copyright (c) 2021-2023 Integrated Informatics Inc Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
# fudgeo
`fudgeo` removes the *fear uncertainty doubt* from using GeoPackages with
Python. `fudgeo` is a simple package for creating OGC GeoPackages, Feature
Classes, Tables, and geometries (read and write).
Inspired by elements of [**pygeopkg**](https://github.com/realiii/pygeopkg).
For more details on OGC GeoPackages, please see the [OGC web page](http://www.geopackage.org/).
## Installation
`fudgeo` is available from the [Python Package Index](https://pypi.org/project/fudgeo/).
### Python Compatibility
The `fudgeo` library is compatible with Python 3.7 to 3.11.
## Usage
`fudgeo` can be used to:
* Create a new empty GeoPackage or Open an existing GeoPackage.
* Create new Feature Classes and Tables (optional overwrite)
* Insert feature (geometry and attributes) into a Feature Class.
* Insert rows into a Table (in the normal SQLite way)
* Drop Feature Classes and Tables
### Create an Empty GeoPackage / Open GeoPackage
```python
from fudgeo.geopkg import GeoPackage
# Creates an empty geopackage
gpkg = GeoPackage.create(r'c:\data\example.gpkg')
# Opens an existing Geopackage (no validation)
gpkg = GeoPackage(r'c:\data\example.gpkg')
```
Geopackages are created with *three* default Spatial References defined
automatically, a pair of Spatial References to handle undefined cases,
and a WGS 84 entry.
The definition of the WGS84 entry is flexible - meaning that the
*WKT for WGS84* can be setup per the users liking. As an example,
use with Esri's ArcGIS means either using the *EPSG WKT* or the *ESRI WKT*. By
default the *ESRI WKT* is used - However, if *EPSG WKT* is desired, you
may provide a ``flavor`` parameter to the create method specifying EPSG.
```python
# Creates an empty geopackage
gpkg = GeoPackage.create(r'c:\temp\test.gpkg', flavor='EPSG')
```
### Create a Feature Class
Use the `create_feature_class` method of a GeoPackage to make
a new feature class. Feature classes require a name and a Spatial
Reference, the name must follow SQLite naming requirements. Each
feature class is defined with `fid` and `SHAPE` fields, additional
fields can be defined during creation.
A Feature Class can be created with *Z* or *M* (or both) enabled. If
either of these options are enabled, the geometry inserted into the
Feature Class **must** include a value for the option specified.
```python
from fudgeo.geopkg import GeoPackage, SpatialReferenceSystem, Field
from fudgeo.enumeration import GeometryType, SQLFieldType
gpkg = GeoPackage.create(r'c:\temp\test.gpkg')
srs_wkt = (
'PROJCS["WGS_1984_UTM_Zone_23N",'
'GEOGCS["GCS_WGS_1984",'
'DATUM["D_WGS_1984",'
'SPHEROID["WGS_1984",6378137.0,298.257223563]],'
'PRIMEM["Greenwich",0.0],'
'UNIT["Degree",0.0174532925199433]],'
'PROJECTION["Transverse_Mercator"],'
'PARAMETER["False_Easting",500000.0],'
'PARAMETER["False_Northing",0.0],'
'PARAMETER["Central_Meridian",-45.0],'
'PARAMETER["Scale_Factor",0.9996],'
'PARAMETER["Latitude_Of_Origin",0.0],'
'UNIT["Meter",1.0]]')
srs = SpatialReferenceSystem(
'WGS_1984_UTM_Zone_23N', 'EPSG', 32623, srs_wkt)
fields = (
Field('heart_rate', SQLFieldType.integer),
Field('power', SQLFieldType.double),
Field('comment', SQLFieldType.text, 100),
Field('is_valid', SQLFieldType.boolean))
fc = gpkg.create_feature_class(
'test', srs, fields=fields, shape_type=GeometryType.point)
```
Read more about spatial references in GeoPackages [here](https://github.com/realiii/pygeopkg/blob/master/README.md#about-spatial-references-for-geopackages)
### Insert Features into a Feature Class (SQL)
Features can be inserted into a Feature Class using SQL.
This example shows the creation of a random point Feature Class and
builds upon the code from previous examples. Note that the create Feature Class
portion of the code is omitted...
```python
from random import choice, randint
from string import ascii_uppercase, digits
from fudgeo.geometry import Point
from fudgeo.geopkg import GeoPackage
# NOTE Builds from previous examples
gpkg = GeoPackage(r'c:\data\example.gpkg')
# Generate some random points and attributes
rows = []
for i in range(10000):
rand_str = ''.join(choice(ascii_uppercase + digits) for _ in range(10))
rand_int = randint(0, 1000)
rand_x = randint(300000, 600000)
rand_y = randint(1, 100000)
rows.append((Point(x=rand_x, y=rand_y, srs_id=32623), rand_int, rand_str))
with gpkg.connection as conn:
conn.executemany(
"""INSERT INTO test (SHAPE, heart_rate, comment)
VALUES (?, ?, ?)""", rows)
```
### Geometry Examples
Review the tests for `fudgeo` for a comprehensive look into
creating geometries, below are some examples showing the simplicity
of this package.
```python
from fudgeo.geometry import Point, LineStringZM, Polygon
# Point in WGS 84
pt = Point(x=-119, y=34)
# Line with ZM Values for use with UTM Zone 23N (WGS 84)
coords = [(300000, 1, 10, 0), (300000, 4000000, 20, 1000),
(700000, 4000000, 30, 2000), (700000, 1, 40, 3000)]
line = LineStringZM(coords, srs_id=32623)
# list of rings where a ring is simply the list of points it contains.
rings = [[(300000, 1), (300000, 4000000), (700000, 4000000),
(700000, 1), (300000, 1)]]
poly = Polygon(rings, srs_id=32623)
```
### Select Features from GeoPackage (SQL)
When selecting features from a GeoPackage feature class use SQL. For
the most part (mainly simple geometries) this can be done via a basic
select statement like:
```python
gpkg = GeoPackage(r'c:\data\example.gpkg')
cursor = gpkg.connection.execute(
"""SELECT SHAPE, heart_rate FROM test""")
features = cursor.fetchall()
```
This will return a list of tuples where each tuple contains a `Point`
object and an integer (heart rate).
When working with extended geometry types (those with *Z* and/or *M*)
then the approach is to ensure SQLite knows how to convert the
geopackage stored geometry to a `fudgeo` geometry, this is done like
so (pretending here that we created `test` table as a point geometry
with z enabled):
```python
gpkg = GeoPackage(r'c:\data\example.gpkg')
cursor = gpkg.connection.execute(
"""SELECT SHAPE "[PointZ]", heart_rate FROM test""")
features = cursor.fetchall()
```
or a little more general, accounting for extended geometry types and possibility of the
geometry column being something other tha SHAPE:
```python
from fudgeo.geopkg import FeatureClass
gpkg = GeoPackage(r'c:\data\example.gpkg')
fc = FeatureClass(geopackage=gpkg, name='test')
cursor = gpkg.connection.execute(f"""
SELECT {fc.geometry_column_name} "[{fc.geometry_type}]", heart_rate
FROM {fc.name}""")
features = cursor.fetchall()
```
## License
[MIT](https://choosealicense.com/licenses/mit/)
نیازمندی
| مقدار | نام |
|---|---|
| - | pytest |
| - | coverage |
| - | twine |
| - | build |
زبان مورد نیاز
| مقدار | نام |
|---|---|
| >=3.7 | Python |
نحوه نصب
نصب پکیج whl fudgeo-0.4.0:
pip install fudgeo-0.4.0.whl
نصب پکیج tar.gz fudgeo-0.4.0:
pip install fudgeo-0.4.0.tar.gz