Removing polygon sliver other than by using graphic-to-feature
Geographic Information SystemsHow do I remove a sliver polygon in ArcGIS? You can inspect the selected polygons to see if they are slivers, then either use the Editor > Merge command or the Eliminate geoprocessing tool (requires an ArcGIS for Desktop Advanced license) to merge the slivers with neighboring polygons. How do you cut a polygon out
How to visualise generic geometry column from SpatiaLite database in QGIS
Geographic Information SystemsHow do I add a geometry column in Postgis? To add a column to an existing table, use the ALTER TABLE DDL, e.g.: ALTER TABLE my_table ADD COLUMN the_geom_mercator geometry(Geometry,3857); How do I view data in Qgis? It’s available as: a Data Source Manager tab, enabled pressing the Open Data Source Manager button ( Ctrl+L
Setting transparency of feature class in ModelBuilder in ArcMap?
Geographic Information SystemsHow do I make a feature transparent in ArcMap? Click Customize > Toolbars > Effects on the main menu. The Effects toolbar appears. Click the layer drop-down arrow and select the layer that you want to appear transparent. and drag the slider bar to adjust the transparency. How do you change the transparency color in
QGIS OpenLayers plugin needs to be reloaded
Geographic Information SystemsHow do I add OpenLayers to QGIS? The OpenLayers plugin is available through the official QGIS plugin repository HERE. You can install by simply adding it to your plugins directory, as described in a previous post, after downloading and unzipping. Select the plugin (if necessary) in the Plugins->Manage plugins … menu, as seen below. How
Raster attribute table not showing up after exporting from R
Geographic Information SystemsHow do I view a raster attribute table? Viewing a raster attribute table Add the raster dataset containing the raster attribute table to the view. In the table of contents, right-click the raster dataset and click Open Attribute Table. How do I export a raster table? You can export a raster attribute table just as
Comparing 2 polygon shapefiles for differences
Geographic Information SystemsHow do you compare polygons? To find the scale factor, we simply create a ratio of the lengths of two corresponding sides of two polygons. If the ratio is the same for all corresponding sides, then this is called the scale factor and the polygons are similar. How do you combine two shapefile polygons? Process
How to remove clouds in High resolution Imagery(.5 mGeoeye)
Geographic Information SystemsWhat is a DN value in a satellite image? Each pixel also has a numerical value, called a digital number (DN), that records the intensity of electromagnetic energy measured for the ground resolution cell represented by that pixel. Digital numbers range from zero to some higher number on a gray scale. How do I remove
How to compute distances between points and polygon borders?
Geographic Information SystemsHow do you calculate the distance between points? Distance between two points is the length of the line segment that connects the two points in a plane. The formula to find the distance between the two points is usually given by d=√((x2 – x1)² + (y2 – y1)²). This formula is used to find the
Is there any labeling (by scale) rule of thumb in Cartography?
Geographic Information SystemsHow do you label a map in geography? Names should be legible (labels are usually as horizontal as possible with no upside-down labels) Names should be clearly associated with the features they refer to (i.e., they should be placed in an unambiguous position). There should be no overlap between names and other map content, if
Adjusting Spatial Accuracy of Ortho Imagery in ArcGIS Desktop?
Geographic Information SystemsWhat is a block adjustment? Block adjustment is the process of computing adjustment (or transformation) based on internal relationship between overlap images, ground control points (GCPs), a camera model, a DEM, and applying the adjustment to the images within a block. How do I create an ortho mapping workspace? Quote from video: Select the imagery