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Our Planet TodayAnswers for geologist, scientists, spacecraft operators
on January 22, 2023

How to extract zones that are contained in bigger zones from two different layers

Geographic Information Systems



Contents:

  • How do I isolate an area in Qgis?
  • How do I subtract one layer from another in Qgis?
  • How do I compare two shapefiles in Qgis?

How do I isolate an area in Qgis?

Quote from video: Features button and click it and go to select features by area or a single click click there and now you can select the area you want when it gets selected uh it will appear in yellow.





How do I subtract one layer from another in Qgis?

How can I do this? If both polygons are separate features, you can delete the small one via the Attribute Table (right-click the layer), toggle the Editing icon (looks like a pencil), select the feature of the polygon you wanted deleted, then select Delete Feature. Thank you.
 

How do I compare two shapefiles in Qgis?

1 Answer



  1. Loop through the first feature collection.
  2. Find any geometries in the second collection that intersect with the current feature.
  3. Union those together (if there are more than one) and subtract (difference) that union from the first feature.
  4. Save the results.


 

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  • Aerosol
  • After Shock
  • Age
  • Agriculture
  • Air
  • Air Currents
  • Air Pollution
  • Air Quality
  • Altitude
  • Antarctica
  • Anthropogenic
  • Archaeology
  • Arctic
  • Asteroids
  • Astrobiology
  • Atmosphere
  • Atmosphere Modelling
  • Atmospheric Chemistry
  • Atmospheric Circulation
  • Atmospheric Dust
  • Atmospheric Optics
  • Atmospheric Radiation
  • Auroras
  • Barometric Pressure
  • Bathymetry
  • Bedrock
  • Biogeochemistry
  • Biomass
  • Biomineralization
  • California
  • Carbon
  • Carbon Capture
  • Carbon Cycle
  • Cartography
  • Cavern
  • Cf Metadata
  • Chaos
  • Climate
  • Climate Change
  • Climate Data
  • Climate Models
  • Climatology
  • Cloud Microphysics
  • Clouds
  • Co2
  • Coal
  • Coastal
  • Coastal Desert
  • Condensation
  • Continent
  • Continental Crust
  • Continental Rifting
  • Convection
  • Coordinate System
  • Core
  • Coriolis
  • Correlation
  • Crust
  • Cryosphere
  • Crystallography
  • Crystals
  • Cyclone
  • Dams
  • Data Analysis
  • Database
  • Dating
  • Decomposition
  • Deforestation
  • Desert
  • Desertification
  • Diamond
  • Drilling
  • Drought
  • Dynamics
  • Earth History
  • Earth History
  • Earth Moon
  • Earth Observation
  • Earth Rotation
  • Earth science
  • Earth System
  • Earthquakes
  • East Africa Rift
  • Ecology
  • Economic Geology
  • Education
  • Electromagnetism
  • Emissions
  • Emissivity Of Water
  • Energy
  • Energy Balance
  • Enso
  • Environmental Protection
  • Environmental Sensors
  • Equator
  • Era
  • Erosion
  • Estuary
  • Evaporation
  • Evapotranspiration
  • Evolution
  • Extreme Weather
  • Field Measurements
  • Fire
  • Flooding
  • Fluid Dynamics
  • Forest
  • Fossil Fuel
  • Fossils
  • Gas
  • Geobiology
  • Geochemistry
  • Geochronology
  • Geode
  • Geodesy
  • Geodynamics
  • Geoengineering
  • Geographic Information Systems
  • Geography
  • Geologic Layers
  • Geology
  • Geology and Geography
  • Geology questions
  • Geometry
  • Geomorphology
  • Geomythology
  • Geophysics
  • Geospatial
  • Geothermal Heat
  • Gfs
  • Glaciation
  • Glaciology
  • Global Weirding
  • Gps
  • Gravity
  • Greenhouse Gases
  • Greenland
  • Grid Spacing
  • Groundwater
  • Hazardous
  • History
  • History Of Science
  • Horizon
  • Human Influence
  • Humidity
  • Hydrocarbons
  • Hydrogeology
  • Hydrology
  • Hypothetical
  • Ice
  • Ice Age
  • Ice Sheets
  • Identification Request
  • Identify This Object
  • Igneous
  • Impact Craters
  • Impacts
  • In Situ Measurements
  • Insolation
  • Instrumentation
  • Interpolation
  • Into Account The Actual Heat From Human Combustion Processes?
  • Inversion
  • Ionizing Radiation
  • Iron
  • Islands
  • Isostasy
  • Isotopic
  • Japan
  • Jet Stream
  • Lakes
  • Land
  • Land Surface
  • Land Surface Models
  • Light
  • Lightning
  • Literature Request
  • Lithosphere
  • Long Coordinates
  • Machine Learning
  • Magma Plumes
  • Magmatism
  • Magnetosphere
  • Mapping
  • Mars
  • Mass Extinction
  • Mathematics
  • Matlab
  • Measurements
  • Mediterranean
  • Mesoscale Meteorology
  • Mesozoic
  • Metamorphism
  • Meteorology
  • Methane
  • Milankovitch Cycles
  • Mineralogy
  • Minerals
  • Mining
  • Models
  • Moon
  • Mountain Building
  • Mountains
  • Netcdf
  • Nitrogen
  • Numerical Modelling
  • Nutrient Cycles
  • Ocean Currents
  • Ocean Models
  • Oceanic Crust
  • Oceanography
  • Oil Accumulation?
  • Oil Reserves
  • Open Data
  • Ore
  • Orogeny
  • Other Organic Matter Improve Soil Structure?
  • Oxygen
  • Ozone
  • Pacific
  • Paleobotany
  • Paleoclimate
  • Paleoclimatology
  • Paleogeography
  • Paleontology
  • Particulates
  • Perfume and Fragrance
  • Petrography
  • Petroleum
  • Petrology
  • Planetary Boundary Layer
  • Planetary Formation
  • Planetary Science
  • Plant
  • Plate Tectonics
  • Pm2.5
  • Poles
  • Pollution
  • Precipitation
  • Predictability
  • Pressure
  • Programming
  • Projection
  • Purpose Of 2 Wooden Poles With A Net Around It In A Farm?
  • Pyroclastic Flows
  • Python
  • R
  • Radar
  • Radiation Balance
  • Radiative Transfer
  • Radioactivity
  • Radiosounding
  • Rain
  • Rainfall
  • Rainforest
  • Rare Earth
  • Reanalysis
  • Reference Request
  • Regional Geology
  • Remote Sensing
  • Research
  • Resources
  • Rivers
  • RMM2?
  • Rock Magnetism
  • Rocks
  • Runoff
  • Salinity
  • Satellite Oddities
  • Satellites
  • Science Fair Project
  • Sea Floor
  • Sea Ice
  • Sea Level
  • Seasons
  • Sedimentology
  • Seismic
  • Seismology
  • Severe Weather
  • Simulation
  • Snow
  • Software
  • Soil
  • Soil Moisture
  • Soil Science
  • Solar Terrestrial Physics
  • Solitary Waves
  • Space and Astronomy
  • Spectral Analysis
  • Statistics
  • Stratigraphy
  • Stratosphere
  • Structural Geology
  • Subduction
  • Sun
  • Taphonomy
  • Technology
  • Tectonics
  • Temperature
  • Terminology
  • Thermodynamics
  • Thunderstorm
  • Tibetan Plateau
  • Tides
  • Time
  • Topography
  • Tornado
  • Transform Fault
  • Tropical Cyclone
  • Troposphere
  • Tsunami
  • Turbulence
  • Uncategorized
  • Underground Water
  • United States
  • Upper Atmosphere
  • Uranium
  • Urban Climate
  • Uv Light
  • Validation
  • Vegetation
  • Vein R Package
  • Visualization
  • Volcanic Eruption
  • Volcanology
  • Water
  • Water Level Being Exceeded
  • Water Table
  • Water Vapour
  • Watershed
  • Wave Modeling
  • Waves
  • Weather Forecasting
  • Weather Satellites
  • Weatherdata
  • Weathering
  • Wildfire
  • Wind
  • Winter
  • Wrf Chem
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