quick question. my bridges are part of the same line as roads so when they cross rivers, i need to make sure they are extended beyond a certain distance. how do i make sure the bridges are beyond the buffer?
I am not sure I understand your question. Are you saying that bridges are part of your road segment? (That's to say your road segment breaks whenever there is a bridge?)
Typically Bridges have there own layer. For example my Bridge layer is a set of Polygon to describe the "Outlined Footprint" of the Bridge which also has a point layer located at the Bridge Center for Inventory purposes -- Bridge Inventory requirements from both State and Federal levels.
Another thing to note is that not all Bridge go over rivers/streams. In an urban environment only a small percentage do.
Maybe a little more information would help us assist you
The first statement is correct. My bridges are part of the road segment and they break when the bridge starts and finishes. So far I used 'Select By Location' to intersect the the river with my bridge line and ran a buffer around the river. I now need to extend any bridges that fall short of the buffer. This is where I am stuck.
You could use the clip tool to clip your roads with your buffers then merge the pieces back together
Some bridges are bigger than the buffer (based on imagery). I need the ones that were drawn out shorter than the buffer and correct them.
Select by location completely within
What if only one side is within. Is there a way to find the ones that are halfway in the buffer?
Use the intersect tool with you bridges and buffers Output type = Point. Then buffer your bridges some small amount like 2 foot. Then use a spatial join with your intersect points and your new buffer creating or using a field to count the points then select those with a count less than 2 this should get you a list of bridges that don't get to the original buffer.
How many bridges do you have? Would manual editing be a viable solution given the amount of time spent trying to find a toolset solution? Does the information have to be update often? Is this a one-off issue?
I agree with Dan Patterson -- I would select all your road segments that are "Bridges" and export them to another layer and call it your bridge layer and then edit/buffer the resulting lines to your liking. Unless there are constant specific rules for adjustment like each end or the beginning must be lengthened 10 feet; doing this by a tool "would be an exercise in frustration."
Another thing to consider is what is the accuracy in which the Bridge Begin/End was collected on your segments? If they were collected accurately would you not be doing a disservice in modifying them so they are visually appealing?
Just some thoughts.
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