{"id":161691,"date":"2008-04-01T18:26:12","date_gmt":"2008-04-01T18:26:12","guid":{"rendered":"http:\/\/www.esri.com\/arcgis-blog\/?post_type=blog&p=161691"},"modified":"2018-12-18T11:59:30","modified_gmt":"2018-12-18T19:59:30","slug":"showing-parcel-hooks-ties-with-representation-symbology","status":"publish","type":"blog","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-desktop\/mapping\/showing-parcel-hooks-ties-with-representation-symbology","title":{"rendered":"Showing parcel hooks\/ties with representation symbology"},"author":4351,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_searchwp_excluded":""},"categories":[22941],"tags":[38451,38411],"industry":[],"product":[36991],"class_list":["post-161691","blog","type-blog","status-publish","format-standard","hentry","category-mapping","tag-cartographic-representations","tag-mapping-center","product-arcgis-desktop"],"acf":{"short_description":"Is there a way to create parcel hooks with ArcGIS 9.2?","flexible_content":[{"acf_fc_layout":"content","content":"

\"Example<\/p>\n

Last week we received a good question on\u00a0Ask a Cartographer<\/a>: is there a way to create parcel hooks with ArcGIS 9.2? After first discovering what parcel hooks were and finding an example of a typical case (shown at left), the answer seemed like a \u2018no-brainer\u2019. Sure, just use the line decoration option on a marker line representation. However, after acquiring some parcel data that included parcel hooks (thanks to\u00a0Greene County, NC<\/a>) and seeing the circumstances where parcel hooks (they\u2019re also called land hooks or parcel ties) are placed on maps, I learned there are are several scenarios that need to be handled.<\/span><\/p>\n

First, the basic form of the symbol is a hook, rather than a tie, which is what the symbol in upper left image initially lead me to understand. To the right is an example what the hook would look like as a representation marker symbol.\u00a0 We created a few of these markers and some representation rule line symbols and saved them in a style called\u00a0RepParcelHooks<\/a>.<\/p>\n

\"Hooks<\/p>\n

We provided two options, one where there were parcel lines included in the representation rule, and another without lines, which\u00a0 will just draw the marker line in the representation rule, i.e., only the hooks. The latter option will permit display of parcel hooks in a different layer (that still refers to your parcel lines data) along with other parcel line layers that may, already be annotated or have dimensions.<\/p>\n

Notice that the hook symbol is inserted at the X in the Marker Editor; this allows the hook to be rotated around that point.<\/p>\n

In terms of your data, the only requirement is that you are using a geodatabase, which allows you to use representations, and that you have an attribute that describes whether a parcel hook is located on a line, and if so, which side of the line. Even if you don\u2019t have that attribute, it is pretty easy to use the Editor with these representation rules to add hooks for your parcel lines.<\/p>\n

As I mentioned above, I found several scenarios that required different representation symbology options. A few are fairly simple to follow, so I\u2019ll describe them first:<\/p>\n

Single hook centered on a parcel line:<\/strong>\u00a0The images below show two scenarios for this situation: one where the hooks are on different lines and the other with the hooks on the same parcel line. The representation rule (below to the right) is set for the second case, i.e., there are two marker lines.\u00a0 The only difference for the first case is that one of the marker line layers is not present.<\/p>\n

\"Hooks<\/p>\n

\"Hooks<\/p>\n

\"Hooks<\/p>\n

Single hook at the end of a parcel line:<\/strong>\u00a0Since parcel line features may be broken based on how their dimensions are described, ia hook may need to be shown at the beginning of a parcel line.\u00a0 In this case the Decorations marker placement option for a representation marker line will work well.<\/p>\n

\"Hooks<\/p>\n

\"Hooks<\/p>\n

Single hook on opposing parcel lines that are offset:<\/strong><\/p>\n

\"Hooks<\/p>\n

The issue here is how to get the hooks to align so they are exactly opposed. For example, the features shown to the right will not align if the hooks are centered on the parcel lines. To do that, an override for these features\u2019 representations is needed.<\/p>\n

\"Hooks<\/p>\n

In order to fully understand how to override a feature\u2019s representation it will be helpful to know how I set up my layer\u2019s symbology. Before I created representations I added a field to my data that I could set to seven possible values.\u00a0 These were based on whether there was a parcel hook, which side of the line the hook appeared (or both sides), and whether the hook\u2019s location would need to be customized. That way, when I created representations I could assign the first three classes to use the \u201cOn line\u201d placement method for the markers in order to center the hooks, and use the \u201cDecoration\u201d placement method for the last three classes.\u00a0 The key to using the decoration method for this last scenario is being able to set, or override, the Begin Position parameter of the representation symbology.<\/p>\n

\"Hooks<\/p>\n

To create an representation override for a given feature it is first necessary to start editing and select one of the features. When you open the Feature Property Editor (which also opens the Attributes window), you will see an additional tab for each representation class defined for your layer\u2019s feature class. If the feature isn\u2019t already using the correct representation rule (based on the decoration geometric effect in this case), you need to change it.\u00a0\u00a0 You type a new value in the Begin Position parameter (as shown to the right).\u00a0 You may need to experiment a bit to get the marker to be shown in the right place.\u00a0 The value for Begin (or End) Position parameter is in points, and is based on distance on your display.<\/p>\n

Tips:<\/strong><\/p>\n