Hollister-Powell & Associates is a full service provider, offering
services ranging from high-quality computerized mapping, demographics,
data exchange, programming solutions, to full on-site computerized
GIS automation solutions.
We specialize in customized boundary creation, demographic
and client statistical data capture within boundary aggregates,
processing and filtering client data and information, standard
and customized mapping products, customized digitizing and
scanning, and customized programming development.
The initial design of our geographic database began in 1977.
It is one of the most comprehensive and mature systems of
its kind in the United States. Through daily client usage,
and internal development and enhancements over the past fifteen
(15) years, it now encompasses a wealth of intrinsic data
layers, and is the most heavily used GIS system in Riverside
County. A small sampling of existing layers includes: census
tracts, blocks and related aggregates; Riverside County school
districts, elementary, middle and high school attendance boundaries;
growth monitoring areas; school district study areas; sphere
of influence zones; zip codes; assembly, congressional, senatorial,
and supervisorial and other political jurisdictions; sheriff
districts and sub-stations, and many more.
We have comprehensive
sub-layers that include bit-mapped image registration data
(aerial photography), contour data (elevations), and point
reference data (site locations). All data layers can be super-imposed
enabling us to construct an impressive mosaic of vector-on
raster-on-point data types. These constructs allow us to produce
a map of an aerial photo in a specific area, with street center
lines, and a corresponding symbol each school sites in the
area. These fundamental relationships allow us to tailor end-products
to meet the specific needs of our clients.
utilize legal documents in the development of our information
base from such agencies as: U.S.G.S., U.S. Census Bureau,
Riverside County Assessor, Survey, Flood Control, Transportation
Land Management Agency, and various other federal, state,
county and city agencies. On-going verification of data is
ensured through reports, plots, quality inspections, field
verifications, usage and queries.
We have the ability to custom address-match any client data
file, and apply spatial attributes from our geographic database.
Although we are typically used in the GIS community for our
address-based layer, we are fully capable of integrating and
processing Assessor parcel-based information into our geographic
base. We have the ability to assign a parcel identification
number to the corresponding street segment, and can isolate
the number of parcels and usage code within a given polygon
development environment consists of an Oracle geographic database,
with expansion to other platforms such as SQL-Server currently
underway. Both our existing system, as well as our newer systems,
will remain compatible with any SQL compliant query languages.
We utilize both Unix and Windows-NT operating systems. Our
in-house interfaces include Visual Basic, Access, Oracle-Forms,
and C. We utilize most PC-based GIS packages, with an in-house
preference for Atlas-GIS, MapInfo,
Maptitude, GIS+, TransCAD, and AutoCAD. We can and have exported/imported
all commonly used GIS formats, including ARC-INFOS and ArcView.
We are accessible on the Internet via the County of Riverside