HABS Photo vs CAD Drawing Comparison


This comparison shows a photo against a CAD drawing.  Both of these images are from the Historic American Building Survey (HABS) of the Mission San Antonio de Valero otherwise known as The Alamo.  This type of comparison can be used to locate defects on the facade in order to annotate them on the drawing or in the case of annotated drawings, to see the defect on the facade.  All from your desktop with out equipment on site.  In addition to documenting existing conditions and preparation of Requests for Proposals (RFP), this presentation format is also useful for researchers and others who may not be able to travel to the site. 

Material Loss Surveys showing degradation of existing-conditions can be completed using historic images against current images.  Historic American Building Survey (HABS), Historic American Engineering Record (HAER) or any historic image including hand made drawings and sketches can be used for this purpose. 

HABS Photography:  Jack Boucher, 1961. 

HABS Drawing: W. Eugene George, Jr. DEL, dated August 1961 on cover page.

Do you need help specifying a HABS project?  We can develop your specification and help you locate qualified vendors.  Contact us for more information.