CA PLS Exam Preparation

Comprehensive preparation for the California Professional Land Surveyor (PLS) exam. Based on the January 2025 Test Plan with 6 modules and 57 topics. Content adapted from CalTrans LS/LSIT Video Exam Preparation Course materials.

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Lesson 4

Topographic Maps

Topographic Maps

Overview

Topographic maps show ground relief and features for design and planning purposes. Creating accurate, readable topographic products requires understanding of cartographic principles and client needs.

Learning Objectives

  • Design effective topographic maps
  • Apply appropriate contour intervals
  • Symbolize features correctly
  • Meet accuracy and content requirements

Key Concepts

Map Design

Effective topographic maps include:

  • Appropriate scale selection
  • Clear contour representation
  • Feature symbolization
  • Legend and notes
  • Reference information

Contour Representation

Principles of contouring:

  • Appropriate interval selection
  • Index and intermediate contours
  • Depression and supplemental contours
  • Contour smoothing
  • Accuracy considerations

Feature Symbolization

Representing physical features:

  • Standard symbols
  • Custom symbols when needed
  • Legend explanation
  • Clear differentiation
  • Appropriate density

Quality Standards

Accuracy and completeness:

  • Positional accuracy standards
  • Vertical accuracy specifications
  • Completeness requirements
  • Attribution standards

Key Terms

  • Contour Interval: Vertical distance between contours
  • Index Contour: Labeled contour at regular intervals
  • Planimetric Feature: Horizontal feature without elevation

Practice Questions

  1. What factors determine the appropriate contour interval?
  2. How should topographic map accuracy be stated and verified?