June 1, 2005
What's an orthophotomap, and how do I catalog it?
A cataloger asks this question on AUTOCAT:
I'm cataloging a map from our state Dept. of Transportation that has been released in 2 versions. Both are exactly the same map, except that one has been superimposed on top of an aerial photograph. Both have exactly the same title, size, scale etc. The only difference is that one says "Photograph not to scale" on the bottom and the other doesn't. (If the map is to scale and the photograph matches the map, then why isn't the photograph to scale too?)
Is there a standard terminology among map catalogers for a map superimposed on top of a photograph, and how in the world do I make the distinction between these 2 maps clear in the OPAC?
Here's the response from map cataloging guru Paige Andrew:
- The "Photograph not to scale" statement leads me to believe that the aerial photograph used as the base has not been "rectified", that is to say it has not been corrected for distances on the ground between known spots using an established national or international geodetic system. The only thing that is relavent about this for cataloging purposes is to possibly include this statement in a 500 note, because the scale statement IS given for the map, which should be used in the 255 field (and of course the 034 field). Why isn't the photograph to scale? Well, quite possibly it is a matter of nobody wanting or needing to make time to get it rectified before it was used for the purpose of a base map.
- Standard terminology for 300 SMD: Any remote-sensing image (the aerial photograph used as a base in this instance) that has map symbols and/or labels placed on top of it, such as latitude and longitude grid, placenames, spot elevations, road networks, river networks, etc. is considered a "map" and thus should be described in 300 $a as "1 map...." That said, if you were cataloging an aerial photograph or satellite image or other remote-sensed image just as it is, the 300 $a would read 1 remote-sensing image... Now, this doesn't necessarily help make each of these maps distinct in terms of the physical description -- you need to use a combination of notes, a specific subject
subdivision, and a specific subject code in the call number to make the "distinction" work, especially since the DOT failed to use a distinct title or alternate title to call out the difference between the two maps.
- Note(s), subdivision, subject code for the aerial-photo based map:
- This type of map is known as an orthophotomap and thus you can add a note that simply says "Orthophotomap" or be a little more descriptive and note that this map is an orthophotomap based on the other identical map.
- The specific subject subdivision to use in this case is "Remote-sensing map" as in:
651 0 $a Nevada $v Remote-sensing map.
- Using the LC G schedule, you will want to distinguish this map from the "plain" DOT state map by adding the subject code of A4 to the call number. So, to distinguish between the two maps, your call numbers would look like the following, and they will file either close to, or next to, each other in the map drawers:
"Plain" map: G4351.P2 2005 .N4
Orthophoto map: G4351.P2A4 2005 .N4
Questions? Contact Stacie.
Category "Electronic Resources"
September 15, 2004
AACR2 Amendments 2004
The JSC website has a list of changes in the 2004 Amendments to AACR2, which have already been incorporated to the version on Cataloger's Desktop. Here's a summary of major rule changes affecting special formats:
- Maps: punctuation for dimensions has changed slightly (3.5D1). For any map where both the dimensions of the map and the dimensions of the sheet are given, the two dimensions should be separated by a comma:
1 map : both sides, col. ; 45 x 80 cm., on sheet 50 x 44 cm.
- Sound recordings and Video recordings: AACR2 (6.5B1, 7.5B1) now allows the option of using a "term in common use" as the specific material designation (e.g., "1 DVD" instead of "1 videodisc"). Please do not apply this option until there has been an official local decision on whether to use it. Until then, continue to use the prescribed SMDs.
- Electronic Resources: There is now an option to provide a physical description for remote-access electronic resources (9.5B3, 9.5C3). This might be especially useful for certain types of remote-access e-resources, such as images. Until a local decision is made, do not apply the option.
Questions or comments? Please contact Stacie.