20260423
10524700
1.0
FALSE
Contours_1ft_FS3x3
2925851.813875
3269933.785100
13741488.921628
13995589.019542
1
002
Projected
GCS_North_American_1983
Linear Unit: Foot_US (0.304801)
NAD_1983_StatePlane_Texas_South_Central_FIPS_4204_Feet
<ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.8'><WKT>PROJCS["NAD_1983_StatePlane_Texas_South_Central_FIPS_4204_Feet",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",1968500.0],PARAMETER["False_Northing",13123333.33333333],PARAMETER["Central_Meridian",-99.0],PARAMETER["Standard_Parallel_1",28.38333333333333],PARAMETER["Standard_Parallel_2",30.28333333333333],PARAMETER["Latitude_Of_Origin",27.83333333333333],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",2278]],VERTCS["NAVD88_height_(ftUS)",VDATUM["North_American_Vertical_Datum_1988"],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",6360]]</WKT><XOrigin>-126725700</XOrigin><YOrigin>-77828800</YOrigin><XYScale>34994581.165044695</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.0032808333333333331</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102740</WKID><LatestWKID>2278</LatestWKID><VCSWKID>105703</VCSWKID><LatestVCSWKID>6360</LatestVCSWKID></ProjectedCoordinateSystem>
20260128
07514200
20260128
07514200
500000
5000
CONTOUR
2026-01-26T00:00:00
OCE GIS
Harris County - Office of the County Engineer
1111 Fannin St
Houston
TX
77002
GIS@hcpid.org
US
OCE GIS
Harris County - Office of the County Engineer
1111 Fannin St
Houston
TX
77002
GIS@hcpid.org
US
OCE GIS
Contours_1ft_FS3x3
Preliminary Harris County 2025 1ft-interval contours derived from a H-GAC DEM.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-weight:bold;">THESE CONTOURS ARE BASED ON PRELIMINARY DATA</SPAN></P><P><SPAN>Houston-Galveston Area Council (H-GAC) provided LiDAR and DEM data for Harris County in December 2024. These contour lines were extrapolated from this preliminary product by Office of the County Engineer (OCE) GIS staff in late 2025 / early 2026 using ArcGIS Pro 3.6.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">OCE GIS Methodology:</SPAN><SPAN> H-GAC's provided TIF raster files had a PCS of NAD 1983 2011 UTM Zone 15N (Meters) with a VCS of NAVD_1988 height (Meters). These tiff files were combined into a mosaic dataset with matching a matching spatial reference. From there, the raster was re-projected into NAD 1983 StatePlane Texas S Central DIPS 4204 (US Feet) / NAVD88 height (US Feet). Pixel values were converted from meters to feet using a constant value of 3.2808333 for ftUS. Focal Statistics were run to smooth elevation data and reduce noise using a 3x3 circular neighborhood and median statistics. From there, contours were generated and a Type field was added and field calculated using [MOD(Contour,5)=0] to populate a 5 foot index/intermediate indicator.</SPAN></P></DIV></DIV></DIV>
H-GAC, OCE GIS
Contours
Elevation
Topography
Isolines
DEM
Terrain
Interval
1ft
H-GAC
Harris County
LIDAR
2025
Preliminary
Draft
<DIV STYLE="text-align:Left;"><DIV><P><SPAN STYLE="font-weight:bold;font-size:12pt">This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. It does not represent an on-the-ground survey and represents only the approximate relative location of property boundaries and other geographic features. All data, specifically including the geographic data herein are provided “as is” without warranty of any kind, either expressed or implied. Use of the information is the sole responsibility of the user.</SPAN></P></DIV></DIV>
Version 6.2 (Build 9200) ; Esri ArcGIS 10.9.1.28388
1
-95.989974
-94.880784
30.198052
29.470806
Contours_1ft_FS3x3
Feature Class
9146761
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Id
Id
Integer
4
0
0
Contour
Contour
Double
8
0
0
Type
Type
String
35
0
0
Shape_Length
Shape_Length
Double
8
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
Shape
Shape
Geometry
0
0
0
Feature geometry.
Esri
Coordinates defining the features.
File Geodatabase Feature Class
dataset
EPSG
6.11(9.0.0)
9146761
Simple
FALSE
9146761
TRUE
FALSE
20260128