"Picture Point"

[wister6813]

The 1961 C&GS recovery note for JB0527, CROUCH, indicates "NO PICTURE POINT AVAILABLE". I do not recall other datasheets with this phrase.

 

Any explanations?

 

Bob

[AZcachemeister]

Curious...

There are several remarks in that report I have not seen before, and that don't entirely make sense to me.

Perhaps some marginal notes got included in the report by accident?

[kayakbird]

I'm wondering how the sight line to RM 2 got blocked by a tree in less than a year?

 

First 1961 recovery:

JB0527''DIRECTION TO REFERENCE MARK 2 WAS NOT CHECKED BECAUSE OF

JB0527''A TREE ON LINE

 

A bit unusual to have two recoveries in the setting year. Looks like some of this information may belong with a different PID. MEL

[DaveD]

A Picture Point (PP), also known as a Photo Control Point or a Photo Identifible Point, is an object that can easily be identfied on an aerial photo (e.g. right angle road intersection, fence corner, corner of a sidewalk etc.) Sometimes that actual geodetic control point will have panels placed around it so that it can be seen on the imagery and act as a PP. PPs are used as references and checks for photogrammetrists to ensure that mosaics of stero images for mapping programs fit together.

[foxtrot_xray]

A Picture Point (PP), also known as a Photo Control Point or a Photo Identifible Point, is an object that can easily be identfied on an aerial photo (e.g. right angle road intersection, fence corner, corner of a sidewalk etc.) Sometimes that actual geodetic control point will have panels placed around it so that it can be seen on the imagery and act as a PP. PPs are used as references and checks for photogrammetrists to ensure that mosaics of stero images for mapping programs fit together.

 

A PERFECT example of this is GO0510. Look at some of the pictures, you'll see the vinyl/plastic fans making a large "X". If you look at the station in Google Earth, you can just barely make out the 'X'. (It appears much better in better resolution imagery, available at http://seamless.usgs.gov).

[Bill93]

The map data at your link appears to be shapefiles. I haven't learned about those. What software do you use to display them?

[foxtrot_xray]

The map data at your link appears to be shapefiles. I haven't learned about those. What software do you use to display them?

Look at the OrthoImagery (when you select an area, select "Modify Order Details" link at the top when you get to the download page, OR, click the 'download' button and select the tyPes there.) Imagery is availalbe in GeoTIFF, which can be imported into a lot of mapping programs, or viewed in any browser/image program.

[+TheBeanTeam]

Ah, this explains my X marks the spot photo for AI2011 I wondered "Why?".

 

 

[wister6813]

I'm familiar with the use of targets for aerial photos, but I didn't connect the use of targets with the phase with "picture point". In the case of JB0527 the disk is 15 inches underground so this traverse station would not be useful as a control point.

 

Thanks for the responses.

 

Bob