Nathan Woodrow NathanW2

QGIS core developer, Python hacker, GIS

NathanW2 / coalesce.html

Created January 18, 2013 12:24

	<h3>coalesce() function</h3>
	Returns the first non-NULL value from the expression list.
	<br>
	This function can take any number of arguments.
	<h4>Syntax</h4>
	<code>coalesce(expression1, expression2 ...)</code><br>

	<h4>Arguments</h4>
	<code>expression</code> - any valid expression or value, irregardless of type.
	<br>

NathanW2 / gist:4577289

Last active April 23, 2019 18:04

	import os, arcpy

	#create blank text file
	with open("C:\\Temp\\GISlayers.txt", "w") as txt:
	for root, dirs, files in os.walk("C:\\Temp\\temp"):
	for f in files:
	#look for shapefiles
	if f.endswith('.shp') or f.endswith('.lyr') or
	f.endswith('.img'):
	desc = arcpy.Describe(root + "\\" + f)

NathanW2 / gist:4707253

Created February 4, 2013 15:00

	# Get the latest changes
	git fetch upstream

	# While on master
	# Bring my master up to line with latest stuff
	git rebase upstream/master

	# Checkout the branch for working
	git checkout -b working

NathanW2 / gist:4714591

Created February 5, 2013 13:54

NathanW2 / gist:4714598

Created February 5, 2013 13:55




	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8">
	<title>My QGIS git workflow</title>
	<meta name="description" content="">
	<meta name="author" content="Nathan Woodrow">

NathanW2 / gist:4714602

Created February 5, 2013 13:56




	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8">
	<title>My QGIS git workflow</title>
	<meta name="description" content="">
	<meta name="author" content="Nathan Woodrow">

NathanW2 / gist:4714603

Created February 5, 2013 13:56




	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8">
	<title>My QGIS git workflow</title>
	<meta name="description" content="">
	<meta name="author" content="Nathan Woodrow">

NathanW2 / gist:5023591

Created February 24, 2013 12:10

	class qchainageDialog(Ui_Dialog):
	def __init__(self):

	Ui_Dialog.__init__(self)
	# Set up the user interface from Designer.
	# self.iface = parent
	self.setupUi(self)

	self.distanceSpinBox.setValue(1)
	self.qgisSettings = QSettings()

NathanW2 / gist:5107896

Created March 7, 2013 13:00

	mylayer = qgis.utils.iface.activeLayer()
	mylayer.select()
	for feature in mylayer:
	geom = feature.geometry()
	attrs = feature.attributeMap()

NathanW2 / gist:5245106

Created March 26, 2013 12:46

	/**
	* This class caches features of a given QgsVectorLayer.
	* The features are automatically updated and/or invalidated, whenever a change happens to the feature.
	*
	* It is the callers responsibility to make sure, that he specifies all required fields in every select operation.
	* There is no guarantee, that a cached feature will contain a field not specified in a previous select operation.
	*
	* Performance:
	* Depending on the usage scenario, it can be a good idea to prepopulate the cache by calling select, nextFeature and
	* and removeCachedFeature. This is especially interesting, whenever requesting a single feature from the dataProvider