How to make pen style show up correct in QGIS map composer legend?
Hiking & ActivitiesHow do I customize my legend in Qgis? Legend items The item order can be changed using the [Up] and [Down] buttons or with ‘drag-and-drop’ functionality. Use the [Add group] button to add a legend group. Use the [plus] and [minus] button to add or remove layers. The [Edit] button is used to edit the
Extracting pixels with value in one raster but NoData in other raster?
Hiking & ActivitiesWhat is the NoData value for raster? NoData is stored as a mask that is part of the raster dataset, or using a pixel value in the dataset that is not used as a valid value elsewhere in the dataset. For example, -9999 is a common value for storing NoData. How do I change a
How do I get ArcGIS tiles to display a single layer when multiple layers are available?
Hiking & ActivitiesWhat is the difference between vector tile and tile in ArcGIS? Vector tiles are much smaller in size than corresponding raster tiles with rendered symbology. This slightly reduces the cost to store and serve the tiles. Vector tile layers can be projected into various coordinate systems, using desktop applications such as ArcGIS Pro, without distortion
Can you do aggregate functions among nearby geometry in PostGIS?
Hiking & ActivitiesCan we use aggregate function in where clause PostgreSQL? Aggregate functions are not allowed because the WHERE clause is used for filtering data before aggregation. What is the difference between geometry and geography in PostGIS? PostGIS gives you a choice of two different ways to store geospatial data: Geometry, where it assumes all of your
Parentheses in attributes
Hiking & ActivitiesDoes attribute always end with parenthesis? Attributes will never have parenthesis since they cannot be executed. Classes have parenthesis because when initially called you’re most likely looking to execute the creation of a new object of that class. Do methods have parentheses? Functions and methods require parentheses. You never call functions without parentheses: the parentheses
How to reproject vector data?
Hiking & ActivitiesHow do you Reproject a vector layer? Steps for reprojecting a shapefile: Open QGIS 2.0 desktop. From the menu bar choose ‘Layers’ à ‘Add vector layer’. A dialog box opens, browse to the location of the required shapefile and click ‘Open’. A shapefile will be displayed on the workspace and the name of the file