Messages

Thanks, good idea to include an email address field in the concatenate column. I changed the spreadsheet accordingly. How do you think that link should be included?

Also, how do I replace a file I attached previously instead of adding a new one?

onomou

The problem with saying what state a subbasin or other water region lies in is that many of them overlap borders, so one might get double the data along state borders.

I must agree. This is a really good resource. I've already made some maps, but this site has one of the best tutorials I have read.

Have you tried popping the Garmin SD card into a card reader and opening the .img file with something like GPSMapEdit (http://www.geopainting.com/en/) to see if your original map was overwritten? It does seem pretty silly to me that Garmin wouldn't lock a card they sold with data on it.

Did you calibrate your altimeter to begin with? I have noticed that my altimeter and compass both get off pretty quickly after calibration (sometimes as little as a week). I have also noticed that if the GPS loses signal for a short bit things can jump around a lot, giving some pretty funny looking tracks when I was actually going straight.

Hi folks,

I have been working on making my own maps for around my area in eastern Washington. After looking through the tutorial (I have made some maps before, but the tutorial lays stuff out pretty well), I realized that there hasn't been a good way to download and organize the high-resolution water data from the NHD. I was clicking through the incredibly slow NHD viewer to download some subregions when I realized that they use a system that's nearly the same as the Seamless server for submitting requests, only the NHD emails you instead of making you wait with a browser window open. I then found a list of every subregion in the US (http://water.usgs.gov/GIS/huc_rdb.html) and threw them all together into a spreadsheet like we have for the DEMs. I'm hoping that someone else can find some use out it. I've attached the spreadsheet, which should be pretty self-explanatory.

The format goes like this:
http://nhdgeo.usgs.gov/jspapps/jsp/nhdQueue/[email protected]&REQUEST_TYPE=1&DISTRIBUTION_TYPE=5&Ref_Polygon_Ids=SubRegionNumber,%20&Ref_Layer_Connection_Id=1&FLOWLINE_COUNT=1&EXTRACT_RESOLUTION=2&INCLUDE_FLOW=F&TEMPLATE_SUFFIX=83v106

Has anyone found a nice map of all the hydrological units? I've found a bunch of maps that just have the boundaries, and also shapefiles which have labels I can show of each subregion, but there just doesn't seem to be any nice PDF of the US with subregions labeled so I can look and see which numbers to download for a specific region. I'm pretty new to this GIS stuff and haven't figured out how to make myself a map of those things from shapefiles.

Anyway, let me know what you all think. I hope someone can find the spreadsheet useful.

onomou

Edit 07-30-09: Added a field to the top so one can change the email address for each field only once.