historical maps final_2

8/7/2019 Historical Maps Final_2

1/9

3/31/20

Joshua Sisskind, University at Albany

GIS Day 2008

University at Albany

Ralph Hill, NYS OGS, Bureau of Land Management

Carola Soltau, University at Albany

Why Utilize Historic Maps?

Digitizing and Conversion Process

Contributions to New York State Initiatives

Future Uses


2/9

3/31/20

We can use historic maps within a geographicinformation system as a tool for understanding thespatial relationships between the current state of ourworld and past phenomena: Positional accuracy can determine if features have been

moved slightly to improve clarity

Where have lands been filled in or where hasdevelopment occurred?

Create a geographic information system

where water grants and easements can

be queried, edited and viewed with

other relevant layers and orthophotos


3/9

3/31/20

Geographic Information System (GIS) A mechanized inventory of geographically distributed

features

Water Grant A donation of public lands under water to a subordinate

government, corporation or an individual

Orthophoto a completely rectified copy of an original photograph

Resolution Resolution can be expressed as the number of pixels per

inch, or PPI Generally, a resolution of 150-600 ppi is used

For our purposes, we will use a resolution of 300 ppi

When selecting a resolution, it is important to balance a

high resolution without having a large file size. Determine a resolution that will be able to determine the

smallest significant figures

We will also use a grayscale to keep the file size at a minimum


4/9

3/31/20


5/9

3/31/20

Rotate map so that north arrow points up Trace each map individually Use consistent color scheme

Grants and Easements = Red Shorelines = Blue Roads = Green Pier and Bulkhead Lines = Magenta Other Features = Yellow

Convert maps to State Plane 1983 (Feet) Displace the traced map to actual location based on aerial imagery and

common features Lighthouses Railroads Streets Can use shoreline as a guide but not as truth, because of coast line

erosion and filled-in land


6/9

3/31/20

Select out each color and save as individual layer once all mapshave been digitized, converted and displaced. This is done using a custom program to select colors from all layers Save using consistent nomenclature, which is based on the attribute

layer and the countys four character county code (FCCC) COUNTY FCCC_LAYER NAME WEST_Roads

Fine tune all layers

QA/QC grants and easements to remove any attributes that havebeen saved within the layer accidentally

Link features from the grants and easements layer with thedatabase where the grants and easements information is stored New York State Lands Under Water projects

Grants were found to be within the approximatelocations of their actual boundaries

Areas of grants and lengths of easements can bevisually estimated and interpreted in relation tosurrounding structures

The areas where significant growth and developmenthas occurred can be determined Especially when there is a question of if this

development is allowed


7/9

3/31/20

Marina and Development Studies Hudson River Estuary Program

New York State Coastal Atlas

Authority Grants

The grantee can buildwithin limits set withinthe patent between thestate and the patentee

The right of the granteeto fill in lands makinguplands out of foreshoreand thus extinguishing

jus publicum

Beneficial EnjoymentGrants


8/9

3/31/20

The Water Grant

GIS can also be used

to determine which

grants are

Beneficial

Enjoyment and

which are

Authority to

determine if it is

allowed for filled in

lands.

New York StateMarina Studies

The Water Grant

GIS can also be used

to determine which

grants are

Beneficial

Enjoyment and

which are

Authority todetermine if it is

allowed for filled in

lands.

New York StateMarina Studies


9/9

3/31/20

Complete the same process with land grants Utilize grants for marina growth students

Utilize maps in historical research Development along the Hudson River

How Albany changed the shoreline of the Hudson

Google Earth and ArcGIS integration

Online database for real-time view

The map layers can be overlaid onto aerial photos,quad maps and other base maps and source data

As new grants and easements are issued, the GIS canbe modified to show them

New grantees can view the location of their grants or

easements in real time Queries can be run showing lands under water

transactions

The original maps can be archived properly

historical maps final_2

Documents