GIS Concepts, Software Environment, and Workplace Safety for Geospatial Professionals

What Is a GIS?

A Geographic Information System (GIS) is a framework for capturing, storing, analyzing, and displaying data that is tied to locations on Earth. Every piece of information in a GIS has two components: a spatial component (where something is) and an attribute component (what it is). This pairing lets professionals answer questions such as "Which parcels are within 500 feet of a floodplain?" or "What is the total length of gas pipelines in this county?"

GIS is the digital backbone of modern surveying and drone operations. Survey crews collect field measurements that are imported into GIS platforms; drone pilots produce aerial imagery and point clouds that become GIS layers. Understanding GIS concepts is therefore foundational to every other skill in this program.

Core GIS Concepts

Layers

A GIS organizes geographic data into layers, each representing one theme: roads, parcels, elevation, land cover, and so on. Layers stack on top of one another to build a map. Think of them as transparent sheets of paper, each carrying a single category of information.

Vector vs. Raster Data

Vector data represents features using geometric shapes:

• Points — wells, survey monuments, utility poles
• Lines (polylines) — roads, pipelines, contour lines
• Polygons — parcels, lakes, building footprints

Raster data represents information as a grid of cells (pixels). Each cell holds a single value. Aerial photographs, satellite imagery, digital elevation models (DEMs), and land-cover classifications are all raster datasets. Raster is ideal for continuous phenomena (elevation changes smoothly across a landscape); vector is ideal for discrete, bounded features.

Attributes

Each vector feature or raster cell can carry descriptive information called attributes. In a parcel layer, attributes might include owner name, lot area, and assessed value. Attributes are stored in a table linked to the geometry — editing the shape does not automatically change the table, and vice versa.

Topology

Topology defines the spatial relationships between features and enforces geometric rules. Rules such as "parcel polygons must not overlap" or "road centerlines must connect at intersections" catch data-entry errors that would otherwise corrupt analysis. Topology is especially critical in surveying, where property boundaries must close mathematically and share edges correctly.

Spatial Relationships

GIS analysis relies on understanding how features relate in space:

• Adjacency — features that share a boundary
• Containment — one feature lies inside another
• Proximity — features within a specified distance
• Intersection — features that cross or overlap

These relationships power tools such as buffers, spatial joins, and overlay analysis.

2D vs. 3D GIS

Traditional GIS is two-dimensional (x and y coordinates on a flat plane). Modern platforms such as ArcGIS Pro support 3D GIS, adding a z-value (elevation or height). Drone-derived point clouds and building information models (BIM) are inherently 3D. Surveyors increasingly deliver 3D deliverables, so recognizing the distinction matters.

The Software Environment

ArcGIS Pro 3.x

ArcGIS Pro is Esri's current desktop GIS platform. Its interface uses a ribbon toolbar similar to Microsoft Office. Key interface areas include:

• Contents pane — lists all layers in the current map
• Catalog pane — browser for files, databases, and toolboxes
• Map view / Scene view — 2D and 3D workspaces
• Geoprocessing pane — access to analysis tools
• Status bar — shows coordinate readout and scale

ArcGIS Pro uses a project file (.aprx) to save all maps, layouts, and tool settings together.

QGIS 3.x

QGIS is a free, open-source GIS platform with a large global user base. Its interface uses a traditional menu bar and toolbars. Key interface areas include:

• Layers panel — equivalent to ArcGIS Pro's Contents pane
• Browser panel — equivalent to the Catalog pane
• Map canvas — the main display area
• Processing Toolbox — access to analysis algorithms

QGIS reads and writes the same common formats as ArcGIS Pro (Shapefile, GeoPackage, GeoTIFF, and others), making the two platforms compatible on most workflows.

Workplace Safety for GIS Workstations

Geospatial professionals spend many hours at computer workstations. OSHA's ergonomics guidance for computer workstations identifies risks including musculoskeletal strain, eye fatigue, and electrical hazards. Applying the following rules protects your long-term health and keeps the lab safe.

Ergonomic Setup

• Chair — adjust seat height so feet rest flat on the floor and thighs are roughly parallel to it. Lumbar support should contact the lower back.
• Monitor — top of the screen at or just below eye level, about an arm's length away. Tilt the screen slightly back (10–20°) to reduce glare.
• Keyboard and mouse — wrists neutral (not bent up or down), elbows at roughly 90°. Use a wrist rest only while pausing, not while typing.
• Lighting — position monitors perpendicular to windows to minimize glare. Adjust ambient lighting to reduce contrast between the screen and the surrounding area.
• Micro-breaks — follow the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds to reduce eye strain.

Electrical Safety

• Inspect power cords and cables before each lab session. Report any damaged insulation immediately — do not use the equipment.
• Never overload power strips or extension cords. Use only equipment approved for the lab.
• Keep liquids away from all electrical equipment.
• Lockout/tagout (LOTO) procedures apply when servicing any powered equipment. In this program, that means you do not open workstation cases or access internal components unless under direct instructor supervision following the facility's written LOTO procedure.
• Know the location of the nearest circuit breaker panel and fire extinguisher before starting any lab session.