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Sketched more of basic API

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This commit is contained in:
Karim Bahgat
2015-03-17 23:49:20 +01:00
parent a8637812b7
commit 5a46702471
5 changed files with 138 additions and 123 deletions
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crstable.txt
+1
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codetype code proj4 ogcwkt esriwkt
loader.py
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import json
#################
# USER FUNCTIONS
#################
# convenience methods for loading from different sources
def from_url(url, format=None):
# first get string from url
# ...
# then load
if format:
# load string using specified format
pass
else:
from_unknown_text(string)
def from_file(filepath):
if filepath.endswith(".prj"):
string = open(filepath, "r").read()
from_esri_wkt(string)
elif filepath.endswith((".geojson",".json")):
crsinfo = json.load(filepath)["crs"]
if crsinfo["type"] == "name":
string = crsinfo["properties"]["name"]
from_unknown_text(string)
elif crsinfo["type"] == "link":
url = crsinfo["properties"]["name"]
type = crsinfo["properties"].get("type")
from_url(url, format=type)
else: raise Exception("invalid geojson crs type: must be either name or link")
elif filepath.endswith((".tif",".tiff",".geotiff")):
pass
# ...
names.py → namemappings.py
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io.py → parser.py
+88 -123
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@@ -1,123 +1,88 @@
import json
#################
# USER FUNCTIONS
#################
# parse from text strings
# possible use module: https://github.com/rockdoc/grabbag/wiki/CRS-WKT-Parser
# also note some paramter descriptions: http://www.geoapi.org/3.0/javadoc/org/opengis/referencing/doc-files/WKT.html
# and see gdal source code: http://gis.stackexchange.com/questions/129764/how-are-esri-wkt-projections-different-from-ogc-wkt-projections
def from_epsg_code(string):
# must go online (or look up local table) to get crs details
pass
def from_esri_code(string):
# must go online (or look up local table) to get crs details
pass
def from_sr_code(string):
# must go online (or look up local table) to get crs details
pass
def from_esri_wkt(string):
# parse arguments into components
# use args to create crs
pass
def from_ogc_wkt(string):
# parse arguments into components
# use args to create crs
pass
def from_unknown_wkt(string):
# detect if ogc wkt or esri wkt
# TIPS: esri wkt datums all use "D_" before the datum name
# then load with appropriate function
pass
def from_proj4(string):
# parse arguments into components
# use args to create crs
pass
def from_ogc_urn(string):
# hmmm, seems like ogc urn could be anything incl online link, epsg, etc...
# if necessary, must go online (or lookup local table) to get details
# maybe test which of these and run their function?
pass
def from_unknown_text(text):
# detect type and load with appropriate function
if string.startswith("urn:"):
from_ogc_urn(string)
elif string.startswith("+proj="):
from_proj4(string)
elif string.startswith("PROJCS["):
from_unknown_wkt(string)
elif string.startswith("EPSG:"):
from_epsg_code(string)
elif string.startswith("ESRI:"):
from_esri_code(string)
elif string.startswith("SR-ORG:"):
from_sr_code(string)
else: raise Exception("Could not detect which type of crs")
def from_geotiff_params(**params):
pass
# convenience methods for loading from different sources
def from_url(url, format=None):
# first get string from url
# ...
# then load
if format:
# load string using specified format
pass
else:
from_unknown_text(string)
def from_file(filepath):
if filepath.endswith(".prj"):
string = open(filepath, "r").read()
from_esri_wkt(string)
elif filepath.endswith((".geojson",".json")):
crsinfo = json.load(filepath)["crs"]
if crsinfo["type"] == "name":
string = crsinfo["properties"]["name"]
from_unknown_text(string)
elif crsinfo["type"] == "link":
url = crsinfo["properties"]["name"]
type = crsinfo["properties"].get("type")
from_url(url, format=type)
else: raise Exception("invalid geojson crs type: must be either name or link")
elif filepath.endswith((".tif",".tiff",".geotiff")):
pass
# ...
# parse from text strings
# possible use module: https://github.com/rockdoc/grabbag/wiki/CRS-WKT-Parser
# also note some paramter descriptions: http://www.geoapi.org/3.0/javadoc/org/opengis/referencing/doc-files/WKT.html
# and see gdal source code: http://gis.stackexchange.com/questions/129764/how-are-esri-wkt-projections-different-from-ogc-wkt-projections
def from_epsg_code(string):
# must go online (or look up local table) to get crs details
pass
def from_esri_code(string):
# must go online (or look up local table) to get crs details
pass
def from_sr_code(string):
# must go online (or look up local table) to get crs details
pass
def from_esri_wkt(string):
# parse arguments into components
# use args to create crs
pass
def from_ogc_wkt(string):
# parse arguments into components
# use args to create crs
pass
def from_unknown_wkt(string):
# detect if ogc wkt or esri wkt
# TIPS: esri wkt datums all use "D_" before the datum name
# then load with appropriate function
pass
def from_proj4(string):
# parse arguments into components
# use args to create crs
pass
def from_ogc_urn(string):
# hmmm, seems like ogc urn could be anything incl online link, epsg, etc...
# if necessary, must go online (or lookup local table) to get details
# maybe test which of these and run their function?
# examples urn:ogc:def:crs:OGC:1.3:CRS1
# or with EPSG instead of OGC
# If OGC, 1.3 is pdf version, and after that is a name from list below
# as found in pdf: "Definition identifier URNs in OGC namespace"
# OGC crs definitions
# URN | CRS name | Definition reference
# urn:ogc:def:crs:OGC:1.3:CRS1 Map CS B.2 in OGC 06-042
# urn:ogc:def:crs:OGC:1.3:CRS84 WGS 84 longitude-latitude B.3 in OGC 06-042
# urn:ogc:def:crs:OGC:1.3:CRS83 NAD83 longitude-latitude B.4 in OGC 06-042
# urn:ogc:def:crs:OGC:1.3:CRS27 NAD27 longitude-latitude B.5 in OGC 06-042
# urn:ogc:def:crs:OGC:1.3:CRS88 NAVD 88 B.6 in OGC 06-042
# urn:ogc:def:crs:OGC:1.3:AUTO42001:99:8888 Auto universal transverse mercator B.7 in OGC 06-042
# urn:ogc:def:crs:OGC:1.3:AUTO42002:99:8888 Auto transverse mercator B.8 in OGC 06-042
# urn:ogc:def:crs:OGC:1.3:AUTO42003:99:8888 Auto orthographic B.9 in OGC 06-042
# urn:ogc:def:crs:OGC:1.3:AUTO42004:99:8888 Auto equirectangular B.10 in OGC 06-042
# urn:ogc:def:crs:OGC:1.3:AUTO42005:99 Auto Mollweide B.11 in OGC 06-042
pass
def from_unknown_text(text):
# detect type and load with appropriate function
if string.startswith("urn:"):
from_ogc_urn(string)
elif string.startswith("+proj="):
from_proj4(string)
elif string.startswith("PROJCS["):
from_unknown_wkt(string)
elif string.startswith("EPSG:"):
from_epsg_code(string)
elif string.startswith("ESRI:"):
from_esri_code(string)
elif string.startswith("SR-ORG:"):
from_sr_code(string)
else: raise Exception("Could not detect which type of crs")
def from_geotiff_params(**params):
pass
online.py → webscrape.py
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