Emails for NHD Extracts

[vespaio]

Hi, 

Does anyone know how long it takes to get the emails for the NHD Subbasins? There was a message after each of my requests telling me I would receive a notice by email as to where I could download the files, but after 9 hours I still haven't received any. I don't know if I should continue waiting or request them again.

Thanks,  Ray

[maps4gps]

Depends on how many request they have and what else the system is doing.  I have got them in less than an hours to a few days.  Sometimes they get lost in the system and they may come a few weeks later - long after I have received my rerequest.

[vespaio]

They're finally coming through now, starting 12 hours after my request.

I notice that there are 7-10 files in each email, each with the same ftp...zip, but with different shapefile numbers (example below).

HydrographySubBasin / 15020002Shapefile 8.3ftp://nhdftp.usgs.gov/NHD181416.zip
HydrographySubBasin / 15020010Shapefile 8.3ftp://nhdftp.usgs.gov/NHD181416.zip

Should I just download the last zip in the list and use it, or how should I handle them?

Thanks again,  Ray

[maps4gps]

You need them all.   The 15020002 etc. numbers are the code for the region, subregion, basin, subbasin.

[vespaio]

Thanks. I'll have to rename the files then since the same .zip forces them to write over the preceding files.

[jbensman]

Sometimes the site goes down and they don't know.  So if you don't get it in a day or so, email them.

Also, you only need to download the file once.  They are all the same file.  It did not used to be like that.  But a few months ago they changed.  I do not know what they have many links to the exact some file, but they do. 

[-Oz-]

I have gone 48hrs then I get a huge chunk.  It seems best to me to request on Friday and get them all over the weekend.

[vespaio]

So what you're saying, if I understand you correctly, is that even if there are 6 shapefiles listed separately in the same .zip file, I can open just one .zip file and get them all?

Based on one of the emails, I opened each of the 6 files in this example in a separate folder and then processed them, since opening them in the same folder would have forced them to overwrite each other.

[-Oz-]

I did just check with my latest set of new NHD data (florida); you only need to download one zip from the email; they all contain the same thing.

[vespaio]

Thanks for the information.

Ray