Cartography Tools
Browse all available cartography tools.
Available tools
- Aspect Direction Octant Classifier from Slope Components Downhill compass aspect from explicitly east/north uphill partial derivatives; flat separately reported, half-octant boundaries round clockwise.
- Azimuth to Quadrant Bearing Formatter Azimuth to quadrant bearing, boundary convention NE at north/east, SE at south and SW at west; 360 normalizes to north.
- Back Bearing Calculator Reverse azimuth, normalized to [0,360), from a forward azimuth in degrees.
- Bathymetric Depth Contour Interval Selector Qualified caller-reference registry: actual survey depth range, scale, charting standard and independently reviewed contour interval. Requires independently applicable source/context/date evidence; not an authoritative table, omitted predictive model, diagnosis, permission, safety or compliance determination.
- Best Fit Scale for Paper Size Finder Minimum continuous denominator fitting projected extent to actual usable print dimensions, fixed orientation; no standard-scale rounding.
- Choropleth Class Break Quantiles Calculator Type-7 linearly interpolated empirical quantile class boundaries; ties retained and no guaranteed equal member count.
- Contour Density Per Cm Checker Number of contour crossings per map centimetre from a count along a measured map transect.
- Contour Density Per Cm Practice Create reproducible practice for Contour Density Per Cm Checker from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Contour Interval Selection by Relief Lookup Qualified caller-reference registry: actual relief, scale, intended map use and independently reviewed contour-interval specification. Requires independently applicable source/context/date evidence; not an authoritative table, omitted predictive model, diagnosis, permission, safety or compliance determination.
- Convergence of Meridians Approximation Calculator Spherical transverse-Mercator meridian convergence approximation for |longitude offset|<=6 degrees; not ellipsoidal survey correction.
- Curved Label Character Spacing Along Path Calculator Signed uniform extra intercharacter gap along caller measured path arclength; negative spacing retained, no glyph orientation or kerning model.
- Declination Drift Adjuster Project signed east-positive magnetic declination using a signed annual change in degrees per year.
- Declination Drift Adjuster Practice Create reproducible practice for Declination Drift Adjuster from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Dot Density Dots Per Unit Count of map dots needed for a value when one dot represents a fixed number of units.
- Dot Gain Compensation Percentage Adjustment Calculator Signed input-tone correction by measured dot gain; rejects corrected tone outside 0–100, no press transfer model.
- Drainage Area Summation Upstream Cells Calculator Sum unique caller already delineated upstream cells; does not infer drainage graph, flow direction or watershed connectivity.
- Easting Northing Digit Split Parser Split an explicit even-length local numeric grid reference; retain leading zeroes, no square/geodetic validation.
- Eight-Figure Grid Reference Precision Meter Checker 8-figure local grid precision: 10m square, not observed accuracy or validated coordinate.
- Elevation Difference Points Signed elevation change from the first point to the second, in metres.
- Enlargement New Scale New 1:N scale denominator after enlarging a map by a linear factor greater than zero.
- Equal Area Class Break Generator Cumulative feature-area weighted class upper boundaries; indivisible features and tied values cannot guarantee equal physical areas.
- Equal Interval Class Break Generator Equal attribute interval boundaries; does not equalize feature counts or map areas.
- Flow Line Width Scaling Line width proportional to flow value relative to a reference flow and reference width.
- Geodetic to Plane Scale Factor Point Check Compare observed local projected/ground distance ratio with independently established point scale factor; no projection model or geodetic correction.
- Gradient Ratio 1-in-N Formatter Format signed gradient as vertical 1-in-N; level handled explicitly, not slope compliance.
- Graduated Circle Overlap Risk Radius Checker Graduated circle positive-area overlap screen from center separation; tangency reported separately.
- Graticule Tick Spacing Degree Selection Lookup Qualified caller-reference registry: actual projection, map extent/scale and independently reviewed graticule tick interval. Requires independently applicable source/context/date evidence; not an authoritative table, omitted predictive model, diagnosis, permission, safety or compliance determination.
- Great Circle Initial Bearing Initial spherical great-circle bearing from the first latitude/longitude to the second, normalized to [0,360).
- Great Circle Initial Bearing Practice Create reproducible practice for Great Circle Initial Bearing from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Grid Reference Digit Padding Normalizer Left-pad explicitly interpreted local coordinate integers; does not append precision digits or infer a full grid square.
- Grid To Magnetic Converter Magnetic azimuth from grid azimuth, signed grid convergence (true minus grid), and east-positive declination.
- Ground Sample Distance Gsd Ground sample distance in centimetres per pixel for a nadir image, using altitude, sensor pixel pitch, and focal length.
- Ground To Map Distance Map distance in centimetres from ground kilometres and scale denominator N.
- Hachure Density Slope Band Classifier Qualified caller-reference registry: actual slope evidence, scale, historical/cartographic convention and independently established hachure-density bands. Requires independently applicable source/context/date evidence; not an authoritative table, omitted predictive model, diagnosis, permission, safety or compliance determination.
- Haversine Distance Cartography Spherical great-circle distance in kilometres using a user-supplied Earth radius.
- Hillshade Altitude Angle Default 45 Checker Compare valid illumination altitude with illustrative 45-degree convention, not an implementation-wide default.
- Hillshade Azimuth Angle Input Validator Validate finite hillshade azimuth in [0,360) degrees clockwise from north; invalid finite angles return false.
- Horizon Distance From Height Geometric horizon distance in kilometres for observer height and spherical Earth radius, without refraction.
- Horizon Distance from Height Practice Create reproducible practice for Horizon Distance from Height from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Hypsometric Tint Break Value Spacing Generator Generate equal elevation tint-band endpoints; no color palette or topographic accuracy inference.
- Index Contour Every Nth Selector Calculator Select every Nth contour ordinal aligned to caller origin, including signed below-datum indices; no elevation rounding.
- Interior Angle Two Bearings Smallest unsigned angle between two azimuth bearings in degrees.
- Intervisibility Line-of-Sight Obstruction Angle Checker Planar line-of-sight height clearance, tangency counts obstructed; no Earth curvature, atmospheric refraction or radio Fresnel analysis.
- Isarithm Interval Round Number Picker Round a positive raw isarithm interval upward to 1/2/5 times a decade; no automatic scientifically suitable contour interval.
- Jenks Natural Breaks Simplified Classifier Exact bounded one-dimensional dynamic-programming Jenks SSE partition, <=128 observations; deterministic earliest split ties, upper bounds may coincide.
- Label Placement Collision Overlap Detector Two Labels Pairwise axis-aligned rectangular label collision area; glyph contours, rotations and global placement omitted.
- Latitude Band Letter from Latitude Finder UTM latitude bands C–X excluding I/O, X spans 72–84 degrees; does not compute a projection or UPS band.
- Latitude Degree To Km Fixed Approximate north-south kilometres per latitude degree on a spherical Earth.
- Latitude Degree to Km Fixed Practice Create reproducible practice for Latitude Degree to Km Fixed from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Leader Line Maximum Length Rule Checker Caller specification screen for leaderLengthMm only; not universal legibility, ADA compliance, print readiness or accessibility certification.
- Legend Item Order Topological Sorter Simple Stable Kahn topological legend ordering from explicit prerequisite edges; rejects cycles, does not infer cartographic semantics.
- Line Weight Print Reproduction Minimum Checker Caller specification screen for lineWidthMm only; not universal legibility, ADA compliance, print readiness or accessibility certification.
- Longitude Degree To Km Departure Approximate east-west kilometres per longitude degree at latitude on a spherical Earth.
- Longitude Degree to Km Departure Practice Create reproducible practice for Longitude Degree to Km Departure from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Magnetic Declination Applier True azimuth from magnetic azimuth plus signed east-positive magnetic declination.
- Magnetic Declination Applier Practice Create reproducible practice for Magnetic Declination Applier from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Magnetic To Grid Converter Grid azimuth from magnetic azimuth, signed grid convergence (true minus grid), and east-positive declination.
- Map Extent Width Height from Bounds at Scale Calculator Projected rectangular ground extent to print dimensions under constant representative fraction; no latitude/longitude distance conversion.
- Map Margins Standard Bleed Allowance Checker Caller specification screen for bleedMm only; not universal legibility, ADA compliance, print readiness or accessibility certification.
- Map Projection Distortion Tissot Indicatrix Ellipse Axes Note Generator Summarize caller independently derived Tissot principal scales; does not compute projection derivatives or orientation.
- Map Scale 1:x Denominator Comparator Compare representative fractions: smaller denominator is larger scale; no actual map accuracy implication.
- Map To Ground Distance Ground distance in kilometres from map distance in centimetres and scale denominator N.
- MGRS 100km Square Letter Pair Validator UTM MGRS 100km square letter inventory by zone set only; northing cycle, latitude-band intersection and UPS excluded.
- Naismith Route Time Rule Walking time in hours using Naismith's rule: 5 km/h horizontal pace plus one hour per 600 m ascent.
- Naismith Route Time Rule Practice Create reproducible practice for Naismith Route Time Rule from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Nautical Mile Minute Arc Converter Length in kilometres of a supplied number of international nautical miles (1852 m each); useful for approximate chart-minute scales.
- Nautical Mile Minute Arc Practice Create reproducible practice for Nautical Mile Minute Arc Converter from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Next Larger A Paper Size Finder ISO 216 A-series neighboring size A0–A10; no oversize 2A0 inferred.
- Next Smaller A Paper Size Finder ISO 216 A-series neighboring size A0–A10; no oversize 2A0 inferred.
- North Arrow Placement Margin Convention Checker Caller specification screen for marginMm only; not universal legibility, ADA compliance, print readiness or accessibility certification.
- Paper A Series Area Mm2 ISO A-series nominal sheet area in square millimetres from the conventional rounded dimensions A0–A10.
- Photo Scale Altitude Focal Approximate vertical aerial-photo scale denominator H/f when altitude above ground and focal length use the same units.
- Photo Scale Altitude Focal Practice Create reproducible practice for Photo Scale Altitude Focal from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Plan Area To Real Area Ground area in square metres represented by a plan area in square centimetres at scale 1:N.
- Print Dpi To Ppm Converter Printer pixels per metre from dots per inch using exactly 0.0254 metre per inch.
- Print DPI to ppm Practice Create reproducible practice for Print DPI to ppm Converter from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Proportional Legend Value Solver Value represented by a circle radius at a specified square-millimetres-per-unit scale.
- Proportional Symbol Radius Circle radius in millimetres whose area is proportional to value at a specified square-millimetres-per-unit scale.
- Quadrant Bearing to Azimuth Converter Four quadrant convention note; numerical conversion implemented separately by the angle input.
- Raster Pixels Print Size Calculator Printed width in centimetres from horizontal pixel count and print resolution in dots per inch.
- Reduction New Scale New 1:N scale denominator after reducing a map by a linear factor in (0,1].
- Rf To Verbal Scale Ground metres represented by one map centimetre at a representative-fraction scale of 1:N.
- Route Cumulative Ascent Summator from Elevation List Sum positive rises along caller ordered measured elevation list; no DEM smoothing or route-position inference.
- Route Cumulative Descent Summator from Elevation List Sum positive falls along caller ordered measured elevation list; no DEM smoothing or route-position inference.
- Scale Bar Segment Length Length of a scale-bar segment on the map in centimetres for a given ground distance and 1:N scale.
- Sheet Area At Scale Km2 Ground area in square kilometres represented by a map sheet's width and height in centimetres at 1:N scale.
- Six-Figure Grid Reference Precision Meter Checker 6-figure local grid precision: 100m square, not observed accuracy or validated coordinate.
- Slope Degree Rise Run Incline angle in degrees from signed vertical rise and positive horizontal run.
- Slope Percent Contour Spacing Horizontal spacing in metres between contours from vertical interval and grade percentage.
- Spot Color Count Budget Limit Checker Actual spot plate count compared with caller budget limit; no printing cost model.
- Statute Nautical Chart Converter International nautical miles from international statute miles (1609.344 m and 1852 m respectively).
- Statute Nautical Chart Practice Create reproducible practice for Statute Nautical Chart Converter from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Strahler Stream Order Pair Merge Resolver Resolve Strahler order for an explicitly established two-stream confluence; no network delineation.
- Symbol Size Minimum mm Legibility Rule Checker Caller specification screen for symbolSizeMm only; not universal legibility, ADA compliance, print readiness or accessibility certification.
- Terrain Ruggedness Index Cell Calculator Riley TRI sqrt(sum squared center-neighbor elevation differences), exactly eight caller observed neighbors.
- Text Height Ground Equivalent Ground height represented by a map text height in millimetres at scale 1:N.
- Text Height Ground Equivalent Practice Create reproducible practice for Text Height Ground Equivalent from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Tile Count to Cover Extent at Zoom Calculator Count inclusive caller established XYZ tile bounds at zoom; does not derive bounds from lon/lat or handle wrapped extents.
- Tile Zoom Level Resolution Approximation Lookup Web Mercator nominal local ground resolution using radius 6378137m, caller tile pixel width; latitude limited to Mercator range.
- Tobler Hiking Speed Estimate Tobler hiking speed in km/h from signed rise/run slope: 6 exp(-3.5 |slope+0.05|).
- Tobler Hiking Speed Estimate Practice Create reproducible practice for Tobler Hiking Speed Estimate from supplied scenarios, returning validated questions and computed answers under the source tool's assumptions and limits.
- Topographic Position Index TPI Difference Calculator Signed center elevation minus unweighted actual neighborhood mean; no standardized landform class.
- Trail Grade Accessibility Max Slope ADA-style Checker Caller specification screen for gradePercent only; not universal legibility, ADA compliance, print readiness or accessibility certification.
- Utm Central Meridian Zone Central meridian in degrees for a numbered UTM zone.
- Utm Zone From Longitude Standard longitude-only UTM zone number, 1–60; excludes the Norway/Svalbard special-zone exceptions.
- Verbal To Rf Scale Denominator N of a 1:N map scale from ground metres represented by one map centimetre.
- Vertical Exaggeration Factor Vertical-to-horizontal scale ratio from the horizontal and vertical 1:N denominators.
- Watershed Divide Single Pit Detection Flag Strict local 8-neighbor raster pit flag; plateaus, no-data, divide connectivity and global drainage omitted.