FEMA FIRM MAP QUESTIONS?

I am researching an elevation project, dwelling is in "Zone X" near "Zone A".

I have visited the site to look for corner markers and scope out the area of work. The parcel is 34 acres.

I currently have the subdivision map, no house location. I have downloaded PAMAP orthorectifed photos, 2 required to cover parcel and PA LIDAR topography, 2 required also and the FIRM panel map, only 1 required. The house and two outbuildings do not appear on any orthophotos. It does appear on Google Earth, and I have yet to play with it.

First problem is that the FIRM panel to scale and set on PA SPC grid lines does not overlay the PA orthophotos. I had to shift the FIRM about 100' East and rotate it 2.5å¡ to match images. I have never seen a FIRM so far off. I am very confident in the PA orthophotos, but field checks will be required.

I have to consider doing more than my typical GPS location work, complicated by the dense canopy. It is a considerable distance away so I want to be as effective as possible with my field work plans.

Anyone with any experience with complicated corrections to a FIRM?

I will begin a conversation with FEMA tomorrow as this appears to require more than typical guidance.

I had first thought this would be an eLOMA, maybe it still is.

Paul in PA.