CONTOUR MAPS

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Why Contour Maps?

Why Contour Maps?

Drone Contour Maps products are mapping datasets that display highly accurate lines showing equal elevation that correspond to the orthometric heights of the bare earth surface. The contour lines and contour intervals depict elevation / altitude and depth, illustrating the general terrain for an area. Improvements in aerial data acquisition and production methodologies have increased the accuracy of current topographic maps, while helping to reduce the time needed to create them.

How MODUS Does It?

To develop topo maps, we use our vast network of certified drone aerial data acquisition professionals. We primarily use aerial imagery and lidar data (supplemented by ground survey where necessary) as larger areas can be mapped more efficiently than through conventional survey methods.

Who Benefits from Drone Topographic Maps?

The surface of the Earth is continuously changing on local, regional, national and global scales. Changes in terrain can have significant impacts for people, economies and the environment. Organizations that will benefit from the information derived from Contour Maps are: State, local, and county governments, Land developers, Departments of Transportation, Engineering firms, and Military entities.

TYPICAL USES FOR DRONE CONTOUR MAPS:

Land Development

Floodplain Analysis

DOT Route Location

Emergency Response

FEMA Mapping

Coastal Engineering

Storm Water Management

Disaster Preparedness

Water Supply and Quality Monitoring

Land Transportation and Safety

GIS

TYPICAL USES FOR DRONE CONTOUR MAPS:

Land Development

Floodplain Analysis

DOT Route Location

Emergency Response

FEMA Mapping

Coastal Engineering

Storm Water Management

Disaster Preparedness

Water Supply and Quality Monitoring

Land Transportation and Safety

GIS

DIGITAL MODEL TECHNICAL SPECIFICATIONS

Contours offered as a value-add to Standard and Enhanced Ortho products are:

2-foot Contours – Derived from 4-inch or 6-inch resolution Ortho

5-foot Contours – Derived from 12-inch resolution Sanborn Ortho

Contours from stereo imagery are aesthetically pleasing and highly accurate lines of equal elevation which are intended to correspond with the orthometric heights of the bare surface. The primary advantage of stereo imagery is the ability to extract cultural and geographic features in three dimensions such as buildings, roads and elevation contours. Stereo imagery is especially important for markets where accurate elevation data is not readily available.

Every fifth contour line is an Index Contour, distinguished using a heavier line style to enhance identification. All contour lines are solid and unbroken except where passing through dense ground cover, building, and under bridges. In these instances, the contour lines are still continuous, but they are attributed and displayed as broken/dashed lines.

Contours offered as a value add to Lidar products are:

6-inch Contours – Derived from High Precision Drone Lidar

1-foot Contours – Derived from High Density Drone Lidar

2-foot Contours – Derived from any Lidar

Contours are derived from a bare earth DEM surface, these contours best represent the high point density benefit of Lidar data. As an option, breaklines can be added to better depict edge of drainage feature, road edges and other sharp breaks or discontinuities in the terrain. Contours from Lidar are normally not smoothed, leading to a ragged appearance, this is not as cartographically as pleasing, however best represent the highly detailed surface. A gridding of the bare earth and smoothing can be applied at customer request to create a more traditional looking contour data set but reduces accuracy overall as a result.

Every fifth contour line is an Index Contour, distinguished using a heavier line style to enhance identification. All contour lines are solid and unbroken except where passing through dense ground cover, building, and under bridges. In these instances, the contour lines are still continuous, but they are attributed and displayed as broken/dashed lines.

Title goes here

contours are developed in accordance with the ASPRS contour guidelines for 1-foot, 2-foot, and 5-foot contour generation, and tested in accordance with NDEP-FEMA Appendix A guidelines. Accuracy testing in accordance with NDEP Version 1.0 May 10 Section 1.5.2.3 and 1.5.3.1 Fundamental Accuracy.

NMASEQUIVALENT CONTOUR INTERVAL

6-inch

1- foot

2- foot

5-foot

NMAS
VMAS 90 CONFIDENCE

0.2 – foot

0.5- fooot

1.0-foot

2.5-foot

NSSDA
RMSEZ

0.15-foot or 4.12 cm

0.30-foot or 9.925cm

0.61-foot or 18.25 cm

1.52-foot or 46.3cm

NSSDA
ACCURACY 95%

0.30-foot or 9.12 cm

0.60-foot or 18.25 cm

1.19-foot or 36.3 cm

2.98-foot or 90.8 cm

Relationship between Horizontal Resolution and Vertical Accuracy (ASPRS 2001) NDEP Section 1.3.8.2

Map datasets compiled at 1″ = 100′with 1′ contours: Comparable to DTMs with post spacing of 1 meter.

Map datasets compiled at 1″ = 200′with 2′ contours: Comparable to DTMs with post spacing of 2 meter.

Map datasets compiled at 1″ = 500′with 5′ contours: Comparable to DTMs with post spacing of 5 meter.

ORDERING INSTRUCTION (add deliver formats)

CONDITIONS

  • Topographic Maps price catalog is subject to change

  • Order acceptance subject to MODUS approval

  • High relief and dense terrain topo maps areas subject to MODUS approval

  • Product is warranted for 90 days as defined in the End User License agreement

  • Shipping and handling fees may apply

DELIVERY FORMATS

  • .dwg (AutoCAD)

  • .dxf (Drawing exchange)

  • .shp (ESRI)

Are you ready to get started with MODUS Maps?

For More Information or to Order MODUS Digital Modeling Products or Services,

Call MODUS Customer Service,

Contact Us by Email at Info@MODUS-Ai.COM, or

Click Below for a Free 20 Minute Project Consultation with One of Our Experts (HIGHLY RECOMMENDED).  

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