Someone turn off the faucet please! (pics)

September 18, 2009
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Posted By Deral at Home on 9/17/2009 at 5:59 PM

Well, another day of rain in Lawton. That's about 6 in a row and it's becoming a little tiresome but I suppose it was appropriate for one of todays tasks. Some work with our latest DFIRMS as approved by FEMA.

Our DFIRMS are pretty easy to work with inside of ArcMap since they are files native to that system but some of our users need to use them in AutoCAD.

Of course the first thing I had to do was peruse the metadata and then reproject or transform from UTM to our Okie South 3502 HARN adjustment.

I don't work a lot with FIRM stuff as we have a Storm Water group and a flood plain manager but I do get the call when they need some help with the coordinate systems or in how to query things.

So I also besides the metadata read through the readme supplied on the lyrs and examined the schemas. Just the grunt work required before you start mucking about with things.

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Goofy thing but the map had the 100 year and 500 year in the same shape file. Not a big deal in ArcMap since you can mess with the display based on the attributes within the table.

I just clicked on the symbology and made a couple of minor changes to show the differences using unique values.

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Then I did some labels using the field LN_Type (this one was important later).

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So I now had a good feel about the data and how it was all set up so I fired up AcadMap in a fresh session and went about importing the arcshape files for the line work. I was going to bring in S_FLD_Haz_Ln_Project.shp.

But if I did not do something else then the 100 year and the 500 year would be in the same layer. Not very friendly with an entire counties worth of data and looked like a lot of editing in Acad to move these to seperate layers.

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A little bit of magic by instead of just letting it import then I clicked on the drawing layer in import.

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It allows you to have the data sorted as its imported by an attribute value. In this case our LN_TYPE.

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Then you can finish up the import and change the layer names, colors and linetypes very easily. I like to do the layers with the theme name in the front. Makes them easy to find when you have them xrefed into a drawing when you need to turn one on or off.

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The linetypes make everything pretty easy to read on the screen or a plot. You don't have to look at the layer to see what a particular line is.

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Purty snazzy. Did all this in about 20 minutes. 138,000 entities brought in and put in the right layers.

Looks nice on the photo.

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Of course this is only a small part of what actually occured. I had the NGS benchmarks and other stuff that was also supplied with our DFIRM data so I did both spatial and data integrity checks during this entire process.

Just a bit of Geomagician work.

And this my friends is what I would use when trying to ply my services in the GIS arena.

While on first glance it does not seem to be the work of a surveyor but all the checks while doing this conversion and importing had the careful eye of one trained in the spatial arts. The redundant checks and constant vigilance to insure the integrity of the data was done with pushing buttons, but not by a button pusher.

Deral




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