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geohashmultidensity.py
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"""
/***************************************************************************
* *
* 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 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
import os
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtCore import QVariant, QUrl
from qgis.core import Qgis, QgsWkbTypes, QgsFields, QgsField, QgsCoordinateTransform, QgsCoordinateReferenceSystem, QgsRectangle, QgsFeature, QgsGeometry, QgsProject
from qgis.core import (
QgsProcessing,
QgsProcessingAlgorithm,
QgsProcessingException,
QgsProcessingParameterMultipleLayers,
QgsProcessingParameterField,
QgsProcessingParameterNumber,
QgsProcessingParameterFeatureSink
)
import processing
from . import geohash
class GeohashMultiLayerDensityAlgorithm(QgsProcessingAlgorithm):
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterMultipleLayers('INPUT', 'Input point vector layers', QgsProcessing.TypeVectorPoint)
)
param = QgsProcessingParameterNumber('RESOLUTION', 'Geohash resolution',
type=QgsProcessingParameterNumber.Integer, minValue=1, defaultValue=6, maxValue=12, optional=False)
if Qgis.QGIS_VERSION_INT >= 31600:
param.setHelp(
'''
The resolution level of the grid, as defined in the geohash standard.
<br>
<table>
<tr>
<th>Resolution<br>Level</th>
<th>Approximate<br>Dimensions</th>
</tr>
<tr>
<td style="text-align: center">1</td>
<td style="text-align: center">≤ 5,000km X 5,000km</td>
</tr>
<tr>
<td style="text-align: center">2</td>
<td style="text-align: center">≤ 1,250km X 625km</td>
</tr>
<tr>
<td style="text-align: center">3</td>
<td style="text-align: center">≤ 156km X 156km</td>
</tr>
<tr>
<td style="text-align: center">4</td>
<td style="text-align: center">≤ 39.1km X 19.5km</td>
</tr>
<tr>
<td style="text-align: center">5</td>
<td style="text-align: center">≤ 4.89km X 4.89km</td>
</tr>
<tr>
<td style="text-align: center">6</td>
<td style="text-align: center">≤ 1.22km X 0.61km</td>
</tr>
<tr>
<td style="text-align: center">7</td>
<td style="text-align: center">≤ 153m X 153m</td>
</tr>
<tr>
<td style="text-align: center">8</td>
<td style="text-align: center">≤ 38.2m X 19.1m</td>
</tr>
<tr>
<td style="text-align: center">9</td>
<td style="text-align: center">≤ 4.77m X 4.77m</td>
</tr>
<tr>
<td style="text-align: center">10</td>
<td style="text-align: center">≤ 1.19m X 0.596m</td>
</tr>
<tr>
<td style="text-align: center">11</td>
<td style="text-align: center">≤ 149mm X 149mm</td>
</tr>
<tr>
<td style="text-align: center">12</td>
<td style="text-align: center">≤ 37.2mm X 18.6mm</td>
</tr>
</table>
'''
)
self.addParameter(param)
self.addParameter(
QgsProcessingParameterField(
'WEIGHT',
'Weight field',
parentLayerParameterName='INPUT',
type=QgsProcessingParameterField.Numeric,
optional=True)
)
self.addParameter(
QgsProcessingParameterFeatureSink('OUTPUT', 'Output geohash density map',
type=QgsProcessing.TypeVectorPolygon, createByDefault=True, defaultValue=None)
)
def processAlgorithm(self, parameters, context, feedback):
layer_list = self.parameterAsLayerList(parameters, 'INPUT', context)
if layer_list is None or len(layer_list) == 0:
raise QgsProcessingException('No point layers were selected.')
resolution = self.parameterAsInt(parameters, 'RESOLUTION', context)
if 'WEIGHT' in parameters and parameters['WEIGHT']:
use_weight = True
weight_field = self.parameterAsString(parameters, 'WEIGHT', context)
else:
use_weight = False
epsg4326 = QgsCoordinateReferenceSystem("EPSG:4326")
fields = QgsFields()
fields.append(QgsField('ID', QVariant.Int))
fields.append(QgsField('GEOHASH', QVariant.String))
fields.append(QgsField('NUMPOINTS', QVariant.Double))
(sink, dest_id) = self.parameterAsSink(
parameters, 'OUTPUT',
context, fields, QgsWkbTypes.Polygon, epsg4326)
ghash = {}
num_layers = len(layer_list)
cumulative = 0
incremental = 85 / num_layers
for layer in layer_list:
src_crs = layer.sourceCrs()
if src_crs != epsg4326:
transform = QgsCoordinateTransform(src_crs, epsg4326, QgsProject.instance())
total = incremental / layer.featureCount() if layer.featureCount() else 0
iterator = layer.getFeatures()
if use_weight:
for cnt, feature in enumerate(iterator):
if feedback.isCanceled():
break
try:
pt = feature.geometry().asPoint()
if src_crs != epsg4326:
pt = transform.transform(pt)
h = geohash.encode(pt.y(), pt.x(), resolution)
weight = feature[weight_field]
if h in ghash:
ghash[h] += weight
else:
ghash[h] = weight
except Exception:
pass
if cnt % 1000 == 0:
feedback.setProgress(int(cnt * total + cumulative))
else:
for cnt, feature in enumerate(iterator):
if feedback.isCanceled():
break
try:
pt = feature.geometry().asPoint()
if src_crs != epsg4326:
pt = transform.transform(pt)
h = geohash.encode(pt.y(), pt.x(), resolution)
if h in ghash:
ghash[h] += 1
else:
ghash[h] = 1
except Exception:
pass
if cnt % 1000 == 0:
feedback.setProgress(int(cnt * total + cumulative))
cumulative += incremental
if len(ghash) == 0:
return {}
total = 15 / len(ghash)
for cnt, key in enumerate(ghash.keys()):
val = ghash[key]
lat1, lat2, lon1, lon2 = geohash.decode_extent(key)
rect = QgsRectangle(lon1, lat1, lon2, lat2)
f = QgsFeature()
f.setGeometry(QgsGeometry.fromRect(rect))
f.setAttributes([cnt, key, val])
sink.addFeature(f)
if cnt % 100 == 0:
feedback.setProgress(int(cnt * total)+85)
return {'OUTPUT': dest_id}
def group(self):
return 'Geohash density'
def groupId(self):
return 'geohashdensity'
def name(self):
return 'geohashmultidensity'
def displayName(self):
return 'Geohash multi-layer density grid'
def icon(self):
return QIcon(os.path.join(os.path.dirname(__file__), 'icons/geohashmultidensity.svg'))
def helpUrl(self):
file = os.path.dirname(__file__) + '/index.html'
if not os.path.exists(file):
return ''
return QUrl.fromLocalFile(file).toString(QUrl.FullyEncoded)
def createInstance(self):
return GeohashMultiLayerDensityAlgorithm()