-------- Original Message -------- Subject: Re: MAPS-L Digest - 21 Aug 2008 to 22 Aug 2008 (#2008-139) Date: Mon, 25 Aug 2008 12:18:22 -0700 From: Colin Kelly <[log in to unmask]> To: Maps, Air Photo & Geospatial Systems Forum <[log in to unmask]> Xiaohong, I have tried to scan mylar-like aerials with not much luck. Just like the scanning of negs involves a film scanner, this might involve the a similar apparatus. I looked at the specs of your scanner and wasn't sure if it has the inherent capability or whether there's a device that will allow scanning of large, half-tone mylar transparencies. You might want to give any of the folks below a call and see what they advise. http://www.asprs.org/wgl/sustain.htm Good Luck. Colin Kelly U of O APRS Coordinator Automatic digest processor wrote: > There are 5 messages totalling 374 lines in this issue. > > Topics of the day: > > 1. USGS 7.5 minute topos offered up > 2. Aerial Photos Scanning Parameters Question > 3. average world wide elevation > 4. Duplicates available August 2008 > 5. average world wide elevation - hypsometric curves > > ---------------------------------------------------------------------- > > Date: Fri, 22 Aug 2008 08:50:33 -0500 > From: Maps-L Moderator <[log in to unmask]> > Subject: USGS 7.5 minute topos offered up > > -------- Original Message -------- > Subject: USGS 7.5 minute topos offered up > Date: Thu, 21 Aug 2008 17:09:09 -0700 > From: Jane Ingalls <[log in to unmask]> > To: [log in to unmask] > > > > We've got the following duplicates to give away. Preference to US > libraries, who will take entire state(s). No reimbursement necessary. > Please include your shipping address. > > Alabama (40 maps) > Arizona (41 maps) > Arkansas (7 maps) > California (48 maps) > Connecticut/Rhode Island:Voluntown (1 map) > Delaware:Bethany Beach (1 map) > Idaho (86 maps) > Kentucky/Ohio:Greenup (1 map) > Louisiana (20 maps) > Maine:Portland West (1 map) > Michigan (3 maps) > Montana/South Dakota (2 maps) > New Mexico (2 maps) > New York:Ellicottville (1 map) > North Dakota:Ice Box Canyon (1 map) > Ohio (43 maps) > Oklahoma:Mingo (1 map) > Oregon (47 maps) > Pennsylvania (2 maps) > South Dakota (17 maps) > Utah (201 maps) > Virginia:Spring Garden (1 map) > Washington (36 maps) > West Virginia (7 maps) > Wisconsin (70 maps) > > > > Jane Ingalls, Assistant Map Librarian > Branner Earth Sciences Library > 201 Mitchell Bldg. > 397 Panama Mall > Stanford, CA 94305-2174 > > ------------------------------ > > Date: Fri, 22 Aug 2008 08:50:54 -0500 > From: Maps-L Moderator <[log in to unmask]> > Subject: Aerial Photos Scanning Parameters Question > > -------- Original Message -------- > Subject: Aerial Photos Scanning Parameters Question > Date: Fri, 22 Aug 2008 08:46:35 -0500 > From: Xiaohong Zhang <[log in to unmask]> > To: <[log in to unmask]> > CC: David C. Clark <[log in to unmask]> > > > > > Dear Colleagues, > > We have a series of aerial photos (approximately 6,825) printed on > translucent sheets (mylar?) that we wish to archive using a large-format > scanner (Vidar HD3630). Our purposes are to: > > 1. To create a digital archive of this unique resource; > 2. To have the digital files serve as the source of our prints so > that we are no longer sending out the mylars; and > 3. To create a geo-referenced “mosaic” of each year’s imagery for use > with GIS mapping software (i.e. ArcMap or ArcIMS). > > The “problems” with these aerial photos include: > > - Our agency has traditionally sent out the photos to a reproduction > company that would make prints using the diazo process. Some of these > images have been sent out numerous times for printing, and as a result > have scratches and creases. > > - With the exception of some of our newer images (which are > continuous-tone), all of the images appear to be halftone, although I > don’t see the variation on dot size that I would expect. When looking at > them on a light table, there appear to be roughly 64 dots per inch. I do > not know if they are “true” half-tone, or if it is some other method > which is optimal for printing using the diazo process. > > - The mylar sheets measure 34” x 34”. The photographic image area is 30” > x 30”, but we also need title and other information at the top and > bottom of each sheet. > > - We do not possess the negatives from any of these sets; they were > retained by the various firms that conducted the flights. > > My question: > > Does anyone have experience with these types of aerial photos? If so, do > you have any recommendation on what would be the best parameters? (Our > proposal is TIFF, Greytone, 400 DPI) > > Thanks a lot for your help! > > Best regards, > > Xiaohong > > ~~~~~~~~~~~~~~~~~~~~~~~~~~ > > XIAOHONG ZHANG > > Data Librarian/Metadata Specialist > > Chicago Metropolitan Agency for Planning (CMAP) > > 233 S Wacker Drive, > > Suite 800, Sears Tower > > Chicago, IL 60606 > > (312) 386-8719 (voice) > > (312) 676-7453 (fax) > > Email:[log in to unmask] > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > ------------------------------ > > Date: Fri, 22 Aug 2008 13:02:45 -0500 > From: Maps-L Moderator <[log in to unmask]> > Subject: average world wide elevation > > -------- Original Message -------- > Subject: average world wide elevation > Date: Fri, 22 Aug 2008 13:55:46 -0400 > From: Lisa Sweeney <[log in to unmask]> > To: [log in to unmask] > > > > Someone was asking for the average elevation above MSL (mean sea level) > of land worldwide. > If any of you know the answer or have a favorite source for this type of > questions please share. > > thanks > lisa > > -- > ********************************* > Head, GIS Services, MIT Libraries > http://libraries.mit.edu/gis/ > 617-258-5598 > > ------------------------------ > > Date: Fri, 22 Aug 2008 13:46:05 -0500 > From: Maps-L Moderator <[log in to unmask]> > Subject: Duplicates available August 2008 > > -------- Original Message -------- > Subject: Duplicates available August 2008 > Date: Fri, 22 Aug 2008 13:42:14 -0500 > From: Carol Russell <[log in to unmask]> > To: <[log in to unmask]> > > > > Hi Maps-Lers: > > > > Map duplicates offered to libraries (only): > > > > Must supply full institutional address. Please respond by September 30, > 2008. > > > > Postage reimbursement required for packages over $10.00 or overseas packages > > > > > > > > Carol Russell, Walter Geology Library, University of Texas at Austin > > > > (respond to e-mail address below) > > > > [log in to unmask] <mailto:[log in to unmask]> > > > > ======================================================================== > > > > Maps duplicate list August 2008 > > > > > > *Sedimentary basins of the world. 1980. 1:40,000,000.* > > > > Tectonic map of North America /by William R. Muehlberger. 1992. > 1:5,000,000. SW &SE sheets. > > > > *Tectonic map of North America. /by Philip Burke King. 1969. > 1:5,000,000. 1 map on 2 sheets.* > > * * > > United States /compiled by the Geological Survey. 1972. 1:2,5000,000. 1 > map on 2 sheets. > > > > Geologic map of Florida. 1981. 1:500,000. > > > > *Fischer quadrangle, Texas—Comal Co. Topo. 1989. 1:24,000 . 4 copies.* > > * * > > *Webbville quadrangle, Texas. Topo. PR-1987. * > > > > Carta geologica (Mexico) 1:1,000,000. 1a ed. 1980. Sheet 3, Monterrey > > > > *Carta de ordenamiento del territorio del Estado de [name of state] > (Mexico). 1981. Scales differ. 31 sheets.* > > > > *Geologic-tectonic map of the Caribbean region.1980. 1:2,500,000. 1map > on 3 sheets. 2 copies.* > > > > *Mapa geológico estructural de Venezuela. 1984. 1:2,500,000. * > > * * > > *Mapa metalogenético de América Central. Metallogenic map of Central > America. 1969. 1:2,000,000. 1 map on 2 sheets.* > > * * > > * Mapa tectonico, norte de America del sur. 1978. 1:2,500,000. 1 map on > 2 sheets.* > > * * > > *Mapa hidrogeológico **‪**(Base preliminar**‪**) de la República > Argentina. 1963. 1:5,000,000*** > > * * > > *Carte métallogénique de l'Europe. 1^st Ed. 1968-1973. Sheet 7 of 9 only.* > > * * > > *Geological and structural map of Eastern Asia. 1988. 1:2,500,000. 6 > sheets* > > * * > > Geology of Australia. 1976. 1:2,500,000 .1 map on 4 sheets > > > > Tectonic map of the Scotia Arc. Edition 1 (1985). 1:3,000,000. 4 copies. > > * * > > *Total magnetic anomaly map, Victoria Land – Ross Sea, Antarctica : > GANOVEX IV 1984-85. 1987. 1:250,000. 7 sheets.* > > ------------------------------ > > Date: Fri, 22 Aug 2008 14:55:22 -0500 > From: Maps-L Moderator <[log in to unmask]> > Subject: Re: average world wide elevation - hypsometric curves > > -------- Original Message -------- > Subject: Re: average world wide elevation - hypsometric curves > Date: Fri, 22 Aug 2008 14:47:38 -0500 > From: James R. Carter <[log in to unmask]> > To: [log in to unmask] > > > > > I cannot give you that number which is rather meaningless, but the question > should be framed in terms of the hypsometric curve for the earth. Do a web > search on that and you will get many views of the graph that shows the > cumulative portion of the Earth's surface above or below any > elevation. Such curves also include depths below sea level. Hypsometric > curves are common in physical geography and geology textbooks. > > Jim Carter > > At 8/22/2008, you wrote: > >> -------- Original Message -------- >> Subject: average world wide elevation >> Date: Fri, 22 Aug 2008 13:55:46 -0400 >> From: Lisa Sweeney <[log in to unmask]> >> To: [log in to unmask] >> >> Someone was asking for the average elevation above MSL (mean sea level) >> of land worldwide. >> If any of you know the answer or have a favorite source for this type of >> questions please share. >> >> thanks >> lisa >> -- >> ********************************* >> Head, GIS Services, MIT Libraries >> http://libraries.mit.edu/gis/ >> 617-258-5598 >> > > --------------------------------------------------------------------- > Dr. James R. "Jim" Carter, Emeritus Professor > Geography/Geology Department > Illinois State University, Normal, IL 61790-4400 USA > -- http://www.ilstu.edu/~jrcarter -- > tel: (309) 438-2833 fax: (309) 438-5310 > [log in to unmask] > > and President, Normal Rotary Club, 2006-07 > ---------------------------------------------------------------------- > > ------------------------------ > > End of MAPS-L Digest - 21 Aug 2008 to 22 Aug 2008 (#2008-139) > ************************************************************* > >