Use symbol layer drawing to override the default drawing order of symbols on maps. When symbols have more than one symbol layer such as a cased road symbolsymbol layer drawing can also control how those individual symbol layers are ordered across symbol classes.
The order that features draw in a map—how they overlap each other—is dictated by the order of the layers in the Contents pane. The layer lowest in the list draws first, followed by the next-lowest layer, and so on, until the features in the topmost layer draw above all else. Within each layer, the features draw in the order they are returned from the database.
Even when a layer has more than one symbol class, such as different road types classified with unique values symbology, the features still draw in order regardless of their symbol class.
An exception to this is a layer drawn with proportional or graduated symbology, where features with larger symbols draw below those with smaller symbols.
All symbols of the layer are reflected in the symbol layer drawing list, even though some are not visible at the current scale. Symbols not visible at the current scale are indicated in italics. Hover over a symbol to see the scale range in which it is drawn.
To learn more about controlling the scales of symbols, see Author a multiscale map. You can also set up symbol layer drawing on a group layer to control the drawing of all its symbols collectively.
When symbol layer drawing is established for a group layer, you cannot set it for individual layers within the group; all symbol layer drawing control is set through the group layer. Caution: If you enable symbol layer drawing on a group layer, any layers within the group that had symbol layer drawing set are reset to the default settings. Similarly, if you add or remove a layer from a group layer that has symbol layer drawing enabled, and symbol layer drawing settings were established on that layer, they are reset to the default settings.
When you add a layer to a group layer, its symbol layers are placed at the top of the drawing order. Changes made to the layer's primary symbology, number of classes, or classification method will also move its symbol layers to the top of the drawing order. This is done so that the symbology updates are visible. Symbol layer drawing is useful for achieving certain graphic effects.
The following are a few examples: Set a road symbol class with a cased line symbol to Join to show connectivity across individual road segments.
Symbol layer drawing
Symbolize overpasses and underpasses by setting multiple road symbol classes with cased line symbols to Join. Line segments from each symbol class are connected, but higher symbol classes draw fully above lower ones, implying a vertical overpass. Show different road categories together by setting Join and Merge on multiple symbol classes together to draw all the road casings first, followed by a consolidation of the fills.
Eliminate county boundaries between polygon areas by state by setting Join and Merge on multiple polygon symbol classes. There are two modes you can use to establish symbol layer drawing. Use the Basic tab to reorder symbol classes, and optionally combine symbols.
Use the Advanced tab only in complex cases where you need to rearrange the draw order of individual symbol layers across symbol classes. Once you have symbol layer drawing settings established, you can turn it on and off and the settings are maintained. Symbol layer drawing is not available for 3D layers. You can only set it on feature layers in a map or in the 2D Layers category of a scene.
Symbol layer drawing cannot be set for layers with unclassed symbols, proportional symbols, dictionary symbology, or for polygon feature layers with graduated symbols.
Symbol layer drawing must be enabled on a feature layer in order to perform symbol layer masking. To learn more about symbol layer masking, see Mask features. Legacy: Symbol layer drawing settings are maintained when you import a map from ArcMapbut only if symbol level drawing is enabled in the ArcMap map document at the time of import.
Use the basic mode to set the draw order of symbol classes within a feature layer, or across all the layers in a group layer.
When you are using symbols with more than one symbol layeryou can also combine symbols with joins and merges.Some features on a map may be more important than others.
Feature weights let you indicate the relative importance of feature classes or features being labeled by a given label class. You can reduce the chance that important features from a given class will be overlapped by labels by assigning the feature class a larger feature weight than other feature classes. Features with feature weights will always be passed to the Maplex Label Engine as barriers even if they are not labeled. If there is an SQL query that limits the number of features displayed, only the subset of features will be added to the placement engine as barriers.
The remaining features will not be displayed or used as barriers by the Maplex Label Engine. The maximum feature weight is 1, Features with weights of 1, are treated as unavailable space for labels. The images below show a before-and-after scenario using feature weights for roads. The image on the left has a feature weight of 0 for the roads.
You can see that several of the labels cross over the road features. The image on the right has a feature weight set for the roads. The labels now try to shift their positions so that they are not overlapping the road features. If it is not possible to place labels where they will not cross a road feature, they will be moved to a position where they will only cross one road instead of several.
The feature weight ranks the importance of features labeled by a given label class, compared to other features, on a scale of 0—1, The Maplex Label Engine places labels to avoid overlapping important features. A feature weight of 0 indicates that the feature should be treated as available space, while a weight of 1, indicates that the feature should not be overlapped by labels.
The Maplex Label Engine first attempts to place labels in an area of free space. If there is no free space available and a feature must be overlapped, a location with the lowest total feature weight is chosen. You can set a feature weight for point and line feature classes. Polygon feature classes have two weights, interior weight and boundary weight, which are set separately. Polygon features have two types of feature weights.When working with a feature class containing overlapping point features with identical locations, it may be desired to individually display the many overlapping points.
For example, the following image shows one point feature symbol selected but there are actually eight overlapping point features in that location, as displayed in the attribute table. The first option uses Maplex Label Engine to create labels for all point features and displaces the labels of the overlapping features.
The other option uses the Disperse Markers tool to scatter the point feature symbols. This method labels the point features with a symbol rather than applying symbology to the layer. The following image shows the dispersed labels of the point features by applying the Maplex Label Engine.
This method displays all the overlapping point features without changing the original point feature coordinates. The Disperse Markers tool finds overlapping representation markers and spreads them based on a minimum spacing and dispersal pattern. Technical Support.
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Is This Content Helpful? Back to top. How To: Offset overlapping point feature symbols Summary When working with a feature class containing overlapping point features with identical locations, it may be desired to individually display the many overlapping points. Using the Maplex Label Engine This method labels the point features with a symbol rather than applying symbology to the layer.
Note : This method is recommended for layers containing fewer than 10 overlapping point features at one location. In some cases, the Maplex Label Engine is unable to display all overlapping point features on the map due to the labeling settings. Set the point layer symbology color to 'no color'. If the layer uses a simple marker symbol, turn off the outlines by unchecking the Use Outline option. Or, uncheck the layer to turn off the drawing of the symbol. Click the Symbology tab.
Click OK in all dialog boxes to apply the symbology settings.
How To: Offset overlapping point feature symbols
Enable labeling for the point layer. Right-click the layer and select Label Features. Add the Labeling toolbar, and enable the Maplex Label Engine. In the Symbol Selector dialog box, click Edit Symbol. Set a marker text background to label the features with a desired symbol. Refer to the following document for steps to create labels with a marker text background: Text inside highway shields or other markersand click Symbol to select the desired symbol.
Click OK in all the dialog boxes to return to the Label Manager dialog box. Set the labels placement to avoid stacking labels and adjust the labels location.Finds point symbols that are overlapping or too close to one another, based on symbology at reference scale, and spreads them apart based on a minimum spacing and dispersal pattern.
Working with symbol level drawing
The input must be a symbolized point feature layer. Multipoint features are not a valid input. The input feature class is changed by this tool. This tool operates by assessing proximity of symbolized point features. The symbology extent and the reference scale are considered in conjunction with one another.
Run this tool only after you have finalized the appearance of your symbols, and ensure that the reference scale corresponds to the final intended output scale. Clustered or coincident point symbols are assessed and processed in groups. The analysis of marker groups is based on a minimum rectangular envelope around each marker. Groups are composed of markers with envelopes that overlap or are within the minimum spacing of others.
Within each group, markers are dispersed to the minimum spacing.intersect arcgis - portions of features which overlap in all layers - arcmap tutorial for beginners
Graphical overlaps may be introduced between marker groups. Use the Detect Graphic Conflict tool to identify conflicts. The minimum separation distance between individual point symbols, in page units.
A distance must be specified and must be greater than or equal to zero. When a positive value is specified, markers will be separated by that value; when a value of zero is specified, point symbols will be touching. The default page unit is Points. Specifies the pattern in which the dispersed point symbols are placed.
A group of point symbols will have a center of mass derived from the locations of all points in the group. The center of mass is then used as the anchor point around which the dispersal pattern operates.
The following Python window script demonstrates how to use the DisperseMarkers tool in immediate mode. This stand-alone script shows an example of using the DisperseMarkers tool.
Feedback on this topic? Skip To Content. Back to Top. Summary Finds point symbols that are overlapping or too close to one another, based on symbology at reference scale, and spreads them apart based on a minimum spacing and dispersal pattern. Illustration Illustration of the dispersal styles.
It only takes a minute to sign up. Is there any way in ArcGIS to prevent symbols from being drawn when they overlap each other? The data will be updated frequently, thus the service must be drawn dynamically no caching. Basically, I have a point feature class that can be very dense or very sparse depending on zoom scale.
When zoomed out, there are too many symbols to display simultaneously in a coherent way.
In an ideal world, I'd like to be able to prevent cluttering by specifying a buffer distance in pixels around each symbol where no other symbols can be drawn from the same layer.
I don't want to cluster the symbols together - I only want to show a single point to represent the area. My symbology is also fairly complex, and involves graduated symbols based on data value as well as value-based rotation as well as several labels with specific placement:.
Since you're now talking about a web map service, a suggestion is to modify the Esri cluster script. This script takes a series of point graphics and clusters those which are too close together to draw individually.
Disperse Markers (Cartography)
By default it draws a large symbol to represent clusters of points. You can modify this to show a single point instead of the cluster - but the script will have done the hard work of removing the extraneous points. It'll automatically work at various scales. Note that this would probably require that you submit a query against the point layer, or use a feature layer rather than a dynamic layer.
This is so that you can obtain access to each of the points individually. You would then submit the collection of points to the clusterer as input. The output would be a "cluster layer" which is a modified graphics layer. You could create a mesh polygonand count the number of points within each polygon. If only one point is found, use it as the output point. If multiple points exists in a polygon, create an output point from the polygon's centroid or pick one input point at random and convert it to the output point layer.
You could symbolise this point differently to show that it represents a cluster of points eg use a graduated symbol based on the number of points. Repeat this process at various zoom levels so you'll have an output point layer for each scale and build a group layer from these points. When zoomed in you'll see all of your points, and when zooming out you'll show clusters of points.
First, have a timeout check so that you do not run the thinning function until the user has stopped for a certain length of time.One of the initial steps in using symbol level drawing is to have a drawing order in mind for the sets of features that you want to display in your map, and how you will organize these features into layers and within layers by their symbols.
Group layers are often very helpful for adding additional control over the drawing order for various layers. Learn more about symbol level drawing. Open the Layer Properties dialog box for the layer or group layer that you want to draw using symbol levels in the table of contents and click the Symbology tab. Click the Advanced button and click Symbol Levels in the drop-down list. If you're working with a group layer, click the Symbol Levels button on the Group tab of the Group Layer Properties dialog box.
Check Draw this layer using the symbol levels specified below. The symbol list in this panel shows the drawing order. Symbols at the bottom of the list are drawn before symbols at the top. Change the symbol drawing order by moving symbols up and down in the symbol list with the arrows or by dragging and dropping them.
For multilevel symbols, you will see check boxes in the Join and Merge columns. Check the Join box for a symbol to achieve a blending effect for all connected features drawn with this symbol. Use Merge to achieve a blending effect for features drawn with different symbols. Check the Merge box for a symbol to blend that symbol with the symbol directly above it in the symbol list.
Click OK to apply these changes and to return to the main Symbology tab. When you enable symbol level drawing for a group layer, you specify the draw order for each symbol for all the feature layers contained by the group layer.
Drawing occurs similarly to the simple feature layer case. The symbol level drawing order in the group layer will control the drawing sequence.
It only takes a minute to sign up. I have lots of lines in one feature class which share the same location but I want to represent them as lines that are next to each other because they have different properties different OWNERS. Which is fine except:. The offset works great, but I need all the lines to be connected and sink in a junction. Something like this:. I know I should use the offset geometric effect.
Are we overcomplicating the problem? Is it simply that you want, cartographically, the lines to pass through each junction not around the junction? If you want to actually join them in the database, buffer the junction points to sufficiently large circles and interset. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 7 years, 5 months ago. Active 1 year, 2 months ago. Viewed 10k times. Ligia Ligia 1, 4 4 gold badges 24 24 silver badges 45 45 bronze badges.
That broken line is most likely due to it being digitized in the wrong direction. Further to Blah's comment, shouldn't that broken line be a single line in the first place? At least if you're only using it for cartography I'd suggest joining the segments together.
That might help obviate this problem. Right, that too
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