Command Line Interface¶
Fiona’s new command line interface is a program named “fio”.
Usage: fio [OPTIONS] COMMAND [ARGS]...
Fiona command line interface.
Options:
-v, --verbose Increase verbosity.
-q, --quiet Decrease verbosity.
--version Show the version and exit.
--help Show this message and exit.
Commands:
bounds Print the extent of GeoJSON objects
buffer Buffer geometries on all sides by a fixed distance.
cat Concatenate and print the features of datasets
collect Collect a sequence of features.
distrib Distribute features from a collection
dump Dump a dataset to GeoJSON.
env Print information about the fio environment.
filter Filter GeoJSON features by python expression
info Print information about a dataset.
insp Open a dataset and start an interpreter.
load Load GeoJSON to a dataset in another format.
It is developed using the click package and is new in 1.1.6.
bounds¶
New in 1.4.5.
Fio-bounds reads LF or RS-delimited GeoJSON texts, either features or collections, from stdin and prints their bounds with or without other data to stdout.
With no options, it works like this:
$ fio cat docs/data/test_uk.shp | head -n 1 \
> | fio bounds
[0.735, 51.357216, 0.947778, 51.444717]
Using --with-id gives you
$ fio cat docs/data/test_uk.shp | head -n 1 \
> | fio bounds --with-id
{"id": "0", "bbox": [0.735, 51.357216, 0.947778, 51.444717]}
cat¶
The cat command concatenates the features of one or more datasets and prints them as a JSON text sequence of features. In other words: GeoJSON feature objects, possibly pretty printed, optionally separated by ASCII RS (x1e) chars using –rs.
The output of fio cat can be piped to fio load to create new
concatenated datasets.
$ fio cat docs/data/test_uk.shp docs/data/test_uk.shp \
> | fio load /tmp/double.shp --driver Shapefile
$ fio info /tmp/double.shp --count
96
$ fio info docs/data/test_uk.shp --count
48
New in 1.4.0.
collect¶
The collect command takes a JSON text sequence of GeoJSON feature objects, such
as the output of fio cat and writes a GeoJSON feature collection.
$ fio cat docs/data/test_uk.shp docs/data/test_uk.shp \
> | fio collect > /tmp/collected.json
$ fio info /tmp/collected.json --count
96
New in 1.4.0.
distrib¶
The inverse of fio-collect, fio-distrib takes a GeoJSON feature collection and writes a JSON text sequence of GeoJSON feature objects.
$ fio info --count tests/data/coutwildrnp.shp
67
$ fio cat tests/data/coutwildrnp.shp | fio collect | fio distrib | wc -l
67
New in 1.4.0.
dump¶
The dump command reads a vector dataset and writes a GeoJSON feature collection
to stdout. Its output can be piped to rio load (see below).
$ fio dump docs/data/test_uk.shp --indent 2 --precision 2 | head
{
"features": [
{
"geometry": {
"coordinates": [
[
[
0.9,
51.36
],
You can optionally dump out JSON text sequences using --x-json-seq. Since
version 1.4.0, fio cat is the better tool for generating sequences.
$ fio dump docs/data/test_uk.shp --precision 2 --x-json-seq | head -n 2
{"geometry": {"coordinates": [[[0.9, 51.36], [0.89, 51.36], [0.79, 51.37], [0.78, 51.37], [0.77, 51.38], [0.76, 51.38], [0.75, 51.39], [0.74, 51.4], [0.73, 51.41], [0.74, 51.43], [0.75, 51.44], [0.76, 51.44], [0.79, 51.44], [0.89, 51.42], [0.9, 51.42], [0.91, 51.42], [0.93, 51.4], [0.94, 51.39], [0.94, 51.38], [0.95, 51.38], [0.95, 51.37], [0.95, 51.37], [0.94, 51.37], [0.9, 51.36], [0.9, 51.36]]], "type": "Polygon"}, "id": "0", "properties": {"AREA": 244820.0, "CAT": 232.0, "CNTRY_NAME": "United Kingdom", "FIPS_CNTRY": "UK", "POP_CNTRY": 60270708.0}, "type": "Feature"}
{"geometry": {"coordinates": [[[-4.66, 51.16], [-4.67, 51.16], [-4.67, 51.16], [-4.67, 51.17], [-4.67, 51.19], [-4.67, 51.19], [-4.67, 51.2], [-4.66, 51.2], [-4.66, 51.19], [-4.65, 51.16], [-4.65, 51.16], [-4.65, 51.16], [-4.66, 51.16]]], "type": "Polygon"}, "id": "1", "properties": {"AREA": 244820.0, "CAT": 232.0, "CNTRY_NAME": "United Kingdom", "FIPS_CNTRY": "UK", "POP_CNTRY": 60270708.0}, "type": "Feature"}
info¶
The info command prints information about a dataset as a JSON object.
$ fio info docs/data/test_uk.shp --indent 2
{
"count": 48,
"crs": "+datum=WGS84 +no_defs +proj=longlat",
"driver": "ESRI Shapefile",
"bounds": [
-8.621389,
49.911659,
1.749444,
60.844444
],
"schema": {
"geometry": "Polygon",
"properties": {
"CAT": "float:16",
"FIPS_CNTRY": "str:80",
"CNTRY_NAME": "str:80",
"AREA": "float:15.2",
"POP_CNTRY": "float:15.2"
}
}
}
You can process this JSON using, e.g., underscore-cli.
$ fio info docs/data/test_uk.shp | underscore extract count
48
You can also optionally get single info items as plain text (not JSON) strings
$ fio info docs/data/test_uk.shp --count
48
$ fio info docs/data/test_uk.shp --bounds
-8.621389 49.911659 1.749444 60.844444
load¶
The load command reads GeoJSON features from stdin and writes them to a vector dataset using another format.
$ fio dump docs/data/test_uk.shp \
> | fio load /tmp/test.shp --driver Shapefile
This command also supports GeoJSON text sequences. RS-separated sequences will
be detected. If you want to load LF-separated sequences, you must specfiy
--x-json-seq.
$ fio cat docs/data/test_uk.shp | fio load /tmp/foo.shp --driver Shapefile
$ fio info /tmp/foo.shp --indent 2
{
"count": 48,
"crs": "+datum=WGS84 +no_defs +proj=longlat",
"driver": "ESRI Shapefile",
"bounds": [
-8.621389,
49.911659,
1.749444,
60.844444
],
"schema": {
"geometry": "Polygon",
"properties": {
"AREA": "float:24.15",
"CNTRY_NAME": "str:80",
"POP_CNTRY": "float:24.15",
"FIPS_CNTRY": "str:80",
"CAT": "float:24.15"
}
}
}
The underscore-cli process command is another way of turning a GeoJSON feature collection into a feature sequence.
$ fio dump docs/data/test_uk.shp \
> | underscore process \
> 'each(data.features,function(o){console.log(JSON.stringify(o))})' \
> | fio load /tmp/test-seq.shp --x-json-seq --driver Shapefile
filter¶
The filter command reads GeoJSON features from stdin and writes the feature to stdout if the provided expression evalutates to True for that feature.
The python expression is evaluated in a restricted namespace containing 3 functions (sum, min, max), the math module, the shapely shape function, and an object f representing the feature to be evaluated. This f object allows access in javascript-style dot notation for convenience.
If the expression evaluates to a “truthy” value, the feature is printed verbatim. Otherwise, the feature is excluded from the output.
For example
fio cat data.shp | fio filter “f.properties.area > 1000.0” | fio collect > large_polygons.geojson
Would create a geojson file with only those features from data.shp where the area was over a given threshold.
Coordinate Reference System Transformations¶
The fio cat command can optionally transform feature geometries to a new
coordinate reference system specified with --dst_crs. The fio collect
command can optionally transform from a coordinate reference system specified
with --src_crs to the default WGS84 GeoJSON CRS. Like collect, fio load
can accept non-WGS84 features, but as it can write files in formats other than
GeoJSON, you can optionally specify a --dst_crs. For example, the WGS84
features read from docs/data/test_uk.shp,
$ fio cat docs/data/test_uk.shp --dst_crs EPSG:3857 \
> | fio collect --src_crs EPSG:3857 > /tmp/foo.json
make a detour through EPSG:3857 (Web Mercator) and are transformed back to WGS84 by fio cat. The following,
$ fio cat docs/data/test_uk.shp --dst_crs EPSG:3857 \
> | fio load --src_crs EPSG:3857 --dst_crs EPSG:4326 --driver Shapefile \
> /tmp/foo.shp
does the same thing, but for ESRI Shapefile output.
New in 1.4.2.