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How to find the optimal position for labels in polygons?
Compute optimal positions for placing labels inside polygons, and optionally plot the labels. Various algorithms for finding the optimal label positions are supported.
Can You label a polygon with no interior polygon?
It is checked by default. To label a polygon hole where there is no interior polygon, the Allow single sided boundary labeling option must also be checked. The image below shows the states of Washington, Oregon, and California labeled with the Boundary Placement style.
Can You label the boundary of a polygon hole?
Allow boundary labeling of polygon holes—This option allows a label to be placed along the boundary of a polygon hole where there is an interior polygon. It is checked by default. To label a polygon hole where there is no interior polygon, the Allow single sided boundary labeling option must also be checked.
How to label a polygon in Maplex label Engine?
The Maplex Label Engine’s Boundary Placement style places labels around the polygon, within its perimeter, usually matching labels of adjoining polygons. You can specify a repetition interval to repeat the label along the length of the boundary and specify an offset distance from the boundary to place the label.
How to label the center of a polygon in ggplot?
Get a data frame of the centroids of your polygons from the original map object. In the data frame you are plotting, ensure there are columns for the ID you want to label, and the longitude and latitude of those centroids. Use geom_text in ggplot to add the labels.
Where do you place a label in Maplex?
The Maplex Label Engine offers the following types of polygon placement positions: Horizontal—Places the label horizontally inside the polygon. See the top left image below. Straight—Places the label linearly inside the polygon.
How do you put labels on polygons in ArcGIS?
Optionally, check the Place label at fixed position within polygon check box. This option is only available with the horizontal and straight label placement styles. Optionally, click the Options button and check the Avoid holes in polygons check box. This option is only available with the horizontal, straight, and curved label placement styles.
How to turn labels on or off in ArcGIS?
You can turn labels on or off by checking the box next to each layer and label class to label on the Label Manager. You can use dynamic labeling for all features in a layer, or you can use label classes to specify different labeling properties for features within the same layer.
How do you label a layer in Excel?
For example, in a layer of cities, you might label those with a population greater than 100,000 with a larger font size and those with a population less than 100,000 with a smaller font size. In addition, if the features in your layer are symbolized with different symbols, you can create label classes from your symbology classes.
How to find an arbitrary position in a polygon?
The inpolygon method finds an arbitrary position in the polygon. This position is usually quite similar to the centroid, but is guaranteed the be inside the polygon. Internally, the method uses the gPointOnSurface function.